What is a PRP ?
A PRP is a probable prime number, a number that nobody knows how to prove
or disprove its primality.
Here are some criterions that can be used to recognize these numbers
:
- N does not have any prime factor up to 2^32.
- N cannot be trivially written into a product.
- Take 3 square-free consecutive bases such that (b1/N)=(b2/N)=(b3/N)= -1. N
should be such that b1^((N-1)/2)=b2^((N-1)/2)=b3^((N-1)/2)= -1 (mod N).
- Take a prime base such that (b/N)= -1 and b<>b1<>b2<>b3.
N should pass the strong test in base b.
- or more (if someone has got an idea) !!!
Submit your PRPs
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See the Latest PRPs
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| Rank |
Probable prime |
Digits (> 50000) |
Who ? |
When ? |
| 5751 | (4*10^130080+41)/9 | 130080 | Serge Batalov | 11/2022 |
| 5752 | 9583*29^88890+736 | 129997 | Eric Chen | 06/2025 |
| 5753 | 2^431804+72511 | 129986 | Enzo Doria | 04/2016 |
| 5754 | 27902^29237-29237^27902 | 129978 | Frank Doornink | 03/2024 |
| 5755 | 33^85579+32 | 129953 | Alfred Reich | 10/2025 |
| 5756 | (2313^38809-1)/(2313^197-1) | 129898 | Ryan Propper | 11/2023 |
| 5757 | (13*10^129896+137)/3 | 129897 | Robert Price | 06/2021 |
| 5758 | (13*10^129890+71)/3 | 129891 | Robert Price | 06/2021 |
| 5759 | 128^61638+127 | 129885 | Alfred Reich | 06/2026 |
| 5760 | 29048^29101-29101^29048 | 129882 | Norbert Schneider | 03/2022 |
| 5761 | 37832^2709+2709^37832 | 129871 | Hans Havermann | 04/2021 |
| 5762 | 31055^15184+15184^31055 | 129853 | Hans Havermann | 04/2021 |
| 5764 | (3^272141-3^136071+1)/7 | 129844 | Serge Batalov | 03/2014 |
| 5763 | Phi(1632846L,3) | 129844 | Anonymous | 03/2025 |
| 5765 | 31385^13702+13702^31385 | 129833 | Hans Havermann | 04/2021 |
| 5766 | (13*10^129826+41)/9 | 129827 | Tyler Busby | 02/2023 |
| 5767 | 28901^29102-29102^28901 | 129822 | Norbert Schneider | 03/2022 |
| 5768 | (47*10^129789-119)/9 | 129790 | Robert Price | 05/2019 |
| 5769 | (9*2^431141+1)/17 | 129787 | Lelio R Paula | 06/2015 |
| 5770 | 25999^29384-29384^25999 | 129730 | Frank Doornink | 03/2024 |
| 5771 | 25771^29408-29408^25771 | 129723 | Frank Doornink | 02/2024 |
| 5772 | (166*10^129712+17)/3 | 129714 | Robert Price | 07/2022 |
| 5773 | (29*2^430881-1)/21 | 129709 | Lelio R Paula | 06/2015 |
| 5774 | 2^430807+1869563 | 129686 | Enzo Doria | 05/2016 |
| 5775 | 2^430721-21429 | 129660 | Enzo Doria | 07/2013 |
| 5776 | Phi(326081,3) | 129648 | Henri Lifchitz | 12/2025 |
| 5777 | (4*10^129618+89)/3 | 129619 | Robert Price | 08/2021 |
| 5778 | (142^60223-1)/141 | 129616 | Anonymous | 06/2024 |
| 5779 | (10^129587-7^129587)/3 | 129587 | Jon Grantham | 07/2023 |
| 5780 | 2^430415-276271 | 129568 | Enzo Doria | 07/2015 |
| 5781 | 32282^10311+10311^32282 | 129558 | Hans Havermann | 04/2021 |
| 5782 | 29486^24741+24741^29486 | 129545 | Hans Havermann | 04/2021 |
| 5783 | (29*10^129543+313)/9 | 129544 | Robert Price | 04/2021 |
| 5784 | 37095^3104+3104^37095 | 129533 | Hans Havermann | 04/2021 |
| 5785 | 31132^14459+14459^31132 | 129514 | Hans Havermann | 04/2021 |
| 5786 | 32582^9435+9435^32582 | 129506 | Hans Havermann | 03/2021 |
| 5787 | 30442^17953+17953^30442 | 129505 | Hans Havermann | 03/2021 |
| 5788 | (199*10^129487-7)/3 | 129489 | Robert Price | 05/2020 |
| 5789 | 2^430142-2791721 | 129486 | Enzo Doria | 03/2016 |
| 5790 | (7*10^129472-13)/3 | 129473 | Robert Price | 07/2018 |
| 5791 | (8*10^129469+79)/3 | 129470 | Robert Price | 10/2020 |
| 5792 | 31678^12213+12213^31678 | 129463 | Hans Havermann | 04/2021 |
| 5793 | 10620^32143-10619^32143 | 129412 | Norbert Schneider | 08/2023 |
| 5794 | (772*10^129406-7)/9 | 129408 | Robert Price | 06/2022 |
| 5795 | (535^47431-1)/534 | 129406 | Tom Wu | 09/2024 |
| 5796 | ((3*20425-8193)*F(618977)-(20425-8193)*L(618977))/2 | 129363 | Yaroslav Berezhko | 03/2025 |
| 5797 | 31100^14439+14439^31100 | 129362 | Hans Havermann | 04/2021 |
| 5798 | 33009^8288+8288^33009 | 129345 | Hans Havermann | 04/2021 |
| 5799 | 25895^29306-29306^25895 | 129334 | Frank Doornink | 03/2024 |
| 5800 | (44^78697+43^78697)/87 | 129333 | Aurel Gibier | 11/2023 |
| 5801 | 29675^22804+22804^29675 | 129324 | Hans Havermann | 04/2021 |
| 5802 | 29068^28099+28099^29068 | 129315 | Hans Havermann | 04/2021 |
| 5803 | 2^429568-21017 | 129313 | Enzo Doria | 07/2013 |
| 5804 | (10^129295+83)/3 | 129295 | Robert Price | 08/2021 |
| 5805 | (853*10^129274-7)/9 | 129276 | Robert Price | 07/2021 |
| 5806 | 998^43100+997 | 129263 | Alfred Reich | 03/2026 |
| 5807 | 30958^14961+14961^30958 | 129249 | Hans Havermann | 04/2021 |
| 5808 | (11*10^129239-179)/3 | 129240 | Robert Price | 09/2018 |
| 5809 | 28659^28988+28988^28659 | 129208 | Norbert Schneider | 02/2021 |
| 5810 | 29423^24616+24616^29423 | 129203 | Hans Havermann | 03/2021 |
| 5811 | 2^429194-112685 | 129201 | Enzo Doria | 06/2014 |
| 5812 | 31*35^83672+17398 | 129197 | Eric Chen | 05/2025 |
| 5813 | 2^429145-2780449 | 129186 | Enzo Doria | 04/2016 |
| 5814 | 32500^9427+9427^32500 | 129168 | Hans Havermann | 04/2021 |
| 5815 | 33577^7014+7014^33577 | 129136 | Hans Havermann | 03/2021 |
| 5816 | 2^428892-113453 | 129110 | Enzo Doria | 07/2014 |
| 5817 | (11*2^428881-7)/15 | 129106 | Renaud Lifchitz | 03/2011 |
| 5818 | 2^428727-113959 | 129060 | Enzo Doria | 10/2014 |
| 5819 | (7*2^428725-1)/13 | 129059 | Lelio R Paula | 05/2014 |
| 5820 | (10^129051-31)/3 | 129051 | Serge Batalov | 12/2014 |
| 5821 | (3^732836)/(2^732836) | 129047 | Henri Lifchitz | 05/2025 |
| 5822 | (134*10^129038+7)/3 | 129040 | Robert Price | 02/2020 |
| 5823 | 2^428564+71161 | 129011 | Enzo Doria | 04/2016 |
| 5824 | 28781^28930+28930^28781 | 129002 | Norbert Schneider | 02/2021 |
| 5825 | 29065^27424+27424^29065 | 128995 | Hans Havermann | 04/2021 |
| 5826 | 2^428502-113285 | 128992 | Enzo Doria | 07/2014 |
| 5827 | 2^428421-21373 | 128968 | Enzo Doria | 06/2013 |
| 5828 | L(616787) | 128901 | Henri Lifchitz | 09/2008 |
| 5829 | (765^44701-1)/764 | 128900 | Tom Wu | 07/2024 |
| 5830 | 20^99055-3 | 128874 | Paul Bourdelais | 12/2020 |
| 5831 | 91^65772-2 | 128851 | Lelio R Paula | 05/2017 |
| 5832 | 2^428022+43 | 128848 | Lelio R Paula | 05/2017 |
| 5833 | 2^427999-459397 | 128841 | Enzo Doria | 05/2015 |
| 5834 | 2^427993+76847 | 128839 | Enzo Doria | 05/2016 |
| 5835 | 31059^14060+14060^31059 | 128833 | Hans Havermann | 03/2021 |
| 5836 | 10^128805+152871 | 128806 | Patrick De Geest | 05/2021 |
| 5837 | 10^128805-10001 | 128805 | Robert Price | 02/2021 |
| 5838 | 2^427824-1851507 | 128788 | Enzo Doria | 08/2015 |
| 5839 | 2^427807-21469 | 128783 | Enzo Doria | 07/2013 |
| 5840 | 29082^26783+26783^29082 | 128772 | Hans Havermann | 04/2021 |
| 5841 | 40055^1638+1638^40055 | 128750 | Hans Havermann | 04/2021 |
| 5842 | (923^43411-1)/922 | 128720 | Tom Wu | 07/2024 |
| 5843 | 11^123594-240 | 128710 | Enzo Doria | 09/2012 |
| 5844 | 2^427504-21503 | 128692 | Enzo Doria | 07/2013 |
| 5845 | 37727^2574+2574^37727 | 128673 | Hans Havermann | 04/2021 |
| 5846 | 29686^21591+21591^29686 | 128668 | Hans Havermann | 04/2021 |
| 5847 | 10^128668-70000000001 | 128668 | Robert Price | 08/2021 |
| 5848 | 10^128668-350729 | 128668 | Alfred Reich | 08/2024 |
| 5849 | Phi(57476,13#) | 128668 | Henri Lifchitz | 12/2025 |
| 5850 | 2^427420+91 | 128667 | Lelio R Paula | 05/2017 |
| 5851 | 8*10^128651-37 | 128652 | Robert Price | 03/2022 |
| 5853 | (68*10^128645-257)/9 | 128646 | Robert Price | 07/2019 |
| 5852 | 128^61050+127 | 128646 | Alfred Reich | 06/2026 |
| 5854 | Phi(236553,7) | 128631 | Henri Lifchitz | 12/2025 |
| 5855 | 2^427269-113635 | 128621 | Enzo Doria | 08/2014 |
| 5856 | 136^60270+135 | 128589 | Alfred Reich | 03/2026 |
| 5857 | 2^427130+1877569 | 128579 | Enzo Doria | 08/2016 |
| 5858 | 2^427068+20011 | 128561 | Enzo Doria | 06/2023 |
| 5859 | 2^427016-115349 | 128545 | Enzo Doria | 07/2015 |
| 5860 | 2^427001+1334025 | 128541 | Henri Lifchitz | 11/2024 |
| 5861 | (4*10^128510+137)/3 | 128511 | Robert Price | 03/2018 |
| 5862 | 2^426889-112879 | 128507 | Enzo Doria | 06/2014 |
| 5863 | 2^426804+1869931 | 128481 | Enzo Doria | 05/2016 |
| 5864 | 2^426750+77635 | 128465 | Enzo Doria | 05/2016 |
| 5865 | 27708^28913-28913^27708 | 128450 | Frank Doornink | 03/2024 |
| 5866 | 36988^2969+2969^36988 | 128445 | Hans Havermann | 03/2021 |
| 5867 | 36664^3185+3185^36664 | 128439 | Hans Havermann | 03/2021 |
| 5868 | 32618^8649+8649^32618 | 128416 | Hans Havermann | 04/2021 |
| 5869 | 28883^27874+27874^28883 | 128391 | Hans Havermann | 04/2021 |
| 5870 | 2^426425-91 | 128367 | Lelio R Paula | 05/2017 |
| 5871 | (15*2^426398-1)/11 | 128359 | Lelio R Paula | 05/2014 |
| 5872 | 2^426352+74971 | 128345 | Enzo Doria | 04/2016 |
| 5873 | (199*10^128343-7)/3 | 128345 | Robert Price | 05/2020 |
| 5874 | 4*10^128343-21 | 128344 | Robert Price | 09/2018 |
| 5875 | (65*10^128338+493)/9 | 128339 | Robert Price | 08/2021 |
| 5876 | 35632^3997+3997^35632 | 128337 | Hans Havermann | 04/2021 |
| 5877 | 2^426300-1863689 | 128330 | Enzo Doria | 03/2016 |
| 5878 | 2^426293+1881017 | 128327 | Enzo Doria | 11/2016 |
| 5879 | (88*10^128324-637)/9 | 128325 | Robert Price | 11/2020 |
| 5880 | Phi(161347,7) | 128320 | Henri Lifchitz | 12/2025 |
| 5881 | Phi(135199,-9) | 128312 | Henri Lifchitz | 12/2025 |
| 5882 | (491*10^128285+31)/9 | 128287 | Robert Price | 04/2022 |
| 5883 | 39103^1908+1908^39103 | 128281 | Hans Havermann | 04/2021 |
| 5884 | 2^426043+35 | 128252 | Robert Price | 11/2015 |
| 5885 | (4*10^128244-19)/3 | 128245 | Robert Price | 03/2018 |
| 5886 | 26220^29021-29021^26220 | 128234 | Frank Doornink | 03/2024 |
| 5887 | 35489^4102+4102^35489 | 128222 | Hans Havermann | 04/2021 |
| 5888 | 34721^4926+4926^34721 | 128208 | Hans Havermann | 04/2021 |
| 5889 | (305*10^128198+1)/9 | 128200 | Robert Price | 02/2020 |
| 5890 | 2^425808-459959 | 128181 | Enzo Doria | 06/2015 |
| 5891 | 30632^15291+15291^30632 | 128178 | Hans Havermann | 04/2021 |
| 5892 | U(623603) | 128177 | Serge Batalov | 07/2024 |
| 5893 | 35981^3648+3648^35981 | 128167 | Hans Havermann | 04/2021 |
| 5894 | 2^425627-113605 | 128127 | Enzo Doria | 08/2014 |
| 5895 | (4*10^128109+119)/3 | 128110 | Robert Price | 12/2021 |
| 5896 | (22*10^128094+53)/3 | 128095 | Robert Price | 07/2019 |
| 5897 | (86*10^128086-221)/9 | 128087 | Robert Price | 09/2019 |
| 5898 | 18565^30002-30002^18565 | 128070 | Norbert Schneider | 01/2015 |
| 5899 | (2^425287-9)/2737 | 128021 | Lelio R Paula | 05/2015 |
| 5900 | (3*2^425233-1)/25 | 128007 | Lelio R Paula | 05/2014 |
| 5901 | Phi(149401,10)/30037901719561 | 128003 | Makoto Kamada | 07/2022 |
| 5902 | 2^425205+4911 | 128000 | Marek Hubal | 02/2017 |
| 5903 | 29241^23836+23836^29241 | 127995 | Hans Havermann | 04/2021 |
| 5904 | 2^425118-113663 | 127974 | Enzo Doria | 08/2014 |
| 5905 | (86*10^127967-329)/9 | 127968 | Robert Price | 01/2020 |
| 5906 | 2^425061+1869761 | 127957 | Enzo Doria | 05/2016 |
| 5907 | 746^44541+44541^746 | 127955 | Norbert Schneider | 07/2019 |
| 5908 | 30236^17043+17043^30236 | 127946 | Hans Havermann | 03/2021 |
| 5909 | 2^424938+212419 | 127920 | Enzo Doria | 08/2023 |
| 5910 | 2^424918-21141 | 127914 | Enzo Doria | 07/2013 |
| 5911 | Phi(274823,-3) | 127907 | Henri Lifchitz | 12/2025 |
| 5912 | (62*10^127903+91)/9 | 127904 | Robert Price | 07/2021 |
| 5913 | 2^424864-29489 | 127897 | Enzo Doria | 08/2015 |
| 5914 | 30438^15893+15893^30438 | 127877 | Hans Havermann | 02/2021 |
| 5915 | (97*10^127858-1)/3 | 127860 | Serge Batalov | 12/2014 |
| 5916 | 28929^26258+26258^28929 | 127845 | Hans Havermann | 03/2021 |
| 5917 | 30563^15220+15220^30563 | 127828 | Hans Havermann | 03/2021 |
| 5918 | 2^424632-2786639 | 127827 | Enzo Doria | 03/2016 |
| 5919 | 10^127821-700001 | 127821 | Robert Price | 08/2021 |
| 5920 | 2^424577-113755 | 127811 | Enzo Doria | 09/2014 |
| 5921 | (7*2^424512-1)/3 | 127792 | Lelio R Paula | 05/2014 |
| 5922 | (56*10^127752+691)/9 | 127753 | Robert Price | 05/2019 |
| 5923 | 11^122629-720 | 127705 | Enzo Doria | 11/2012 |
| 5924 | 22*10^127645+3 | 127647 | Robert Price | 01/2020 |
| 5925 | 28715^27844+27844^28715 | 127631 | Hans Havermann | 03/2021 |
| 5926 | (56*10^127612+187)/9 | 127613 | Robert Price | 10/2021 |
| 5927 | (5*36^81995+821)/7 | 127609 | Eric Chen | 01/2021 |
| 5928 | 4*10^127562-39 | 127563 | Robert Price | 09/2020 |
| 5929 | 32595^8186+8186^32595 | 127547 | Hans Havermann | 03/2021 |
| 5930 | 2^423696-21429 | 127546 | Enzo Doria | 07/2013 |
| 5931 | 2^423664-1864559 | 127536 | Enzo Doria | 03/2016 |
| 5932 | 37889^2322+2322^37889 | 127530 | Hans Havermann | 03/2021 |
| 5933 | 37668^2429+2429^37668 | 127523 | Hans Havermann | 03/2021 |
| 5934 | 3^267267-4 | 127519 | Henri Lifchitz | 10/2014 |
| 5935 | fibonacci(610144)-2 | 127513 | Jon Grantham | 08/2023 |
| 5936 | 26253^28852-28852^26253 | 127503 | Frank Doornink | 03/2024 |
| 5937 | (103*10^127491+17)/3 | 127493 | Robert Price | 08/2020 |
| 5938 | 29376^21869+21869^29376 | 127487 | Hans Havermann | 03/2021 |
| 5939 | 31186^12241+12241^31186 | 127483 | Hans Havermann | 02/2021 |
| 5940 | (19^99689+5^99689)/24 | 127477 | Robert Price | 09/2013 |
| 5941 | 7239^33023-7238^33023 | 127459 | Norbert Schneider | 02/2026 |
| 5942 | 27069^28754-28754^27069 | 127452 | Frank Doornink | 01/2024 |
| 5943 | (21*2^423372+1)/101 | 127447 | Lelio R Paula | 05/2014 |
| 5944 | 30594^14645+14645^30594 | 127446 | Hans Havermann | 03/2021 |
| 5945 | 2^423328-21537 | 127435 | Enzo Doria | 07/2013 |
| 5946 | (67*10^127413-7)/3 | 127415 | Robert Price | 01/2020 |
| 5947 | (5*34^83193+700233)/11 | 127408 | Eric Chen | 08/2023 |
| 5948 | (2*10^127407+73)/3 | 127407 | Robert Price | 09/2020 |
| 5949 | (2^423165-7)/25 | 127384 | Lelio R Paula | 05/2015 |
| 5950 | (7726^32768+1)/13917994151414876602369 | 127379 | Kellen Shenton | 04/2021 |
| 5951 | (4*10^127349+17)/3 | 127350 | Tyler Busby | 01/2023 |
| 5952 | 29512^20647+20647^29512 | 127341 | Hans Havermann | 03/2021 |
| 5953 | 2^422987-3001935 | 127332 | Paul Bourdelais | 07/2023 |
| 5954 | (112*10^127324+17)/3 | 127326 | Robert Price | 03/2020 |
| 5956 | 29565^20252+20252^29565 | 127321 | Hans Havermann | 03/2021 |
| 5955 | 232^232^232+1831^1831 | 127321 | Henri Lifchitz | 03/2025 |
| 5957 | fibonacci(609165)-3 | 127308 | Jon Grantham | 08/2023 |
| 5959 | (F(5)^182099-F(4)^182099)/F(3) | 127282 | Wayne Halsdorf | 08/2013 |
| 5958 | (5^182099-3^182099)/2 | 127282 | Kellen Shenton | 05/2022 |
| 5960 | (16*10^127259+197)/3 | 127260 | Robert Price | 04/2019 |
| 5961 | (26*10^127240+61)/3 | 127241 | Robert Price | 10/2019 |
| 5962 | (234483*27^88884-145)/26 | 127230 | Curtis Bright | 05/2015 |
| 5963 | 2^422515-114997 | 127190 | Enzo Doria | 06/2015 |
| 5964 | 5*10^127179-3 | 127180 | Robert Price | 07/2015 |
| 5965 | 31678^10343+10343^31678 | 127176 | Hans Havermann | 03/2021 |
| 5966 | (44*10^127169-233)/9 | 127170 | Robert Price | 01/2019 |
| 5967 | 34947^4352+4352^34947 | 127162 | Hans Havermann | 03/2021 |
| 5968 | 6*10^127158+19 | 127159 | Robert Price | 11/2021 |
| 5969 | 30469^14902+14902^30469 | 127155 | Hans Havermann | 03/2021 |
| 5970 | 5*10^127153+77 | 127154 | Robert Price | 12/2018 |
| 5971 | 29941^17620+17620^29941 | 127130 | Hans Havermann | 02/2021 |
| 5972 | 31607^10516+10516^31607 | 127119 | Hans Havermann | 03/2021 |
| 5973 | (19*10^127118-97)/3 | 127119 | Robert Price | 10/2021 |
| 5974 | (29*10^127111+691)/9 | 127112 | Robert Price | 08/2021 |
| 5975 | 736^44335+44335^736 | 127104 | Norbert Schneider | 07/2019 |
| 5976 | 33040^7023+7023^33040 | 127090 | Hans Havermann | 03/2021 |
| 5977 | (4*10^127081+167)/9 | 127081 | Robert Price | 03/2022 |
| 5978 | 29748^18661+18661^29748 | 127052 | Hans Havermann | 03/2021 |
| 5979 | 27905^28578-28578^27905 | 127049 | Frank Doornink | 03/2024 |
| 5980 | -516776642557847117490*Bern(37960)/34256837217082767928421792453 | 127042 | Thomas Ritschel | 06/2017 |
| 5981 | (78^67141-1)/77 | 127036 | Paul Bourdelais | 09/2017 |
| 5982 | (14*10^127014-137)/3 | 127015 | Robert Price | 04/2021 |
| 5983 | 31436^10965+10965^31436 | 127002 | Hans Havermann | 03/2021 |
| 5984 | 28905^24758+24758^28905 | 127001 | Hans Havermann | 03/2021 |
| 5985 | 2^421860-113285 | 126993 | Enzo Doria | 07/2014 |
| 5986 | (10^127030+7)/81234833/9230384921/6092460488946445358851 | 126991 | Alfred Reich | 07/2021 |
| 5987 | (2^421827-7)/11 | 126982 | Lelio R Paula | 05/2015 |
| 5988 | 26268^28729-28729^26268 | 126966 | Frank Doornink | 03/2024 |
| 5989 | 11^121910-840 | 126957 | Enzo Doria | 12/2012 |
| 5990 | (56*10^126935+187)/9 | 126936 | Robert Price | 10/2021 |
| 5991 | 28915^24538+24538^28915 | 126933 | Hans Havermann | 03/2021 |
| 5992 | (29*10^126928-77)/3 | 126929 | Robert Price | 02/2020 |
| 5993 | (259*10^126919-1)/3 | 126921 | Robert Price | 12/2020 |
| 5994 | 10^126919+204567 | 126920 | Patrick De Geest | 05/2021 |
| 5995 | (2^421617+100280245065) | 126920 | Paul Bourdelais | 05/2022 |
| 5996 | 10^126919-100001 | 126919 | Robert Price | 07/2020 |
| 5997 | 28340^28503+28503^28340 | 126907 | Norbert Schneider | 02/2021 |
| 5998 | 2^421534-3001935 | 126895 | Paul Bourdelais | 07/2023 |
| 5999 | (71^68539+1)/72 | 126882 | Paul Bourdelais | 09/2017 |
| 6000 | (5*10^126871-119)/3 | 126872 | Robert Price | 03/2018 |
