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
See the Top discoverers
See the Latest PRPs
Search by form
| Rank |
Probable prime |
Digits (> 50000) |
Who ? |
When ? |
| 5751 | 31*35^83672+17398 | 129197 | Eric Chen | 05/2025 |
| 5752 | 2^429145-2780449 | 129186 | Enzo Doria | 04/2016 |
| 5753 | 32500^9427+9427^32500 | 129168 | Hans Havermann | 04/2021 |
| 5754 | 33577^7014+7014^33577 | 129136 | Hans Havermann | 03/2021 |
| 5755 | 2^428892-113453 | 129110 | Enzo Doria | 07/2014 |
| 5756 | (11*2^428881-7)/15 | 129106 | Renaud Lifchitz | 03/2011 |
| 5757 | 2^428727-113959 | 129060 | Enzo Doria | 10/2014 |
| 5758 | (7*2^428725-1)/13 | 129059 | Lelio R Paula | 05/2014 |
| 5759 | (10^129051-31)/3 | 129051 | Serge Batalov | 12/2014 |
| 5760 | (3^732836)/(2^732836) | 129047 | Henri Lifchitz | 05/2025 |
| 5761 | (134*10^129038+7)/3 | 129040 | Robert Price | 02/2020 |
| 5762 | 2^428564+71161 | 129011 | Enzo Doria | 04/2016 |
| 5763 | 28781^28930+28930^28781 | 129002 | Norbert Schneider | 02/2021 |
| 5764 | 29065^27424+27424^29065 | 128995 | Hans Havermann | 04/2021 |
| 5765 | 2^428502-113285 | 128992 | Enzo Doria | 07/2014 |
| 5766 | 2^428421-21373 | 128968 | Enzo Doria | 06/2013 |
| 5767 | L(616787) | 128901 | Henri Lifchitz | 09/2008 |
| 5768 | (765^44701-1)/764 | 128900 | Tom Wu | 07/2024 |
| 5769 | 20^99055-3 | 128874 | Paul Bourdelais | 12/2020 |
| 5770 | 91^65772-2 | 128851 | Lelio R Paula | 05/2017 |
| 5771 | 2^428022+43 | 128848 | Lelio R Paula | 05/2017 |
| 5772 | 2^427999-459397 | 128841 | Enzo Doria | 05/2015 |
| 5773 | 2^427993+76847 | 128839 | Enzo Doria | 05/2016 |
| 5774 | 31059^14060+14060^31059 | 128833 | Hans Havermann | 03/2021 |
| 5775 | 10^128805+152871 | 128806 | Patrick De Geest | 05/2021 |
| 5776 | 10^128805-10001 | 128805 | Robert Price | 02/2021 |
| 5777 | 2^427824-1851507 | 128788 | Enzo Doria | 08/2015 |
| 5778 | 2^427807-21469 | 128783 | Enzo Doria | 07/2013 |
| 5779 | 29082^26783+26783^29082 | 128772 | Hans Havermann | 04/2021 |
| 5780 | 40055^1638+1638^40055 | 128750 | Hans Havermann | 04/2021 |
| 5781 | (923^43411-1)/922 | 128720 | Tom Wu | 07/2024 |
| 5782 | 11^123594-240 | 128710 | Enzo Doria | 09/2012 |
| 5783 | 2^427504-21503 | 128692 | Enzo Doria | 07/2013 |
| 5784 | 37727^2574+2574^37727 | 128673 | Hans Havermann | 04/2021 |
| 5785 | 29686^21591+21591^29686 | 128668 | Hans Havermann | 04/2021 |
| 5786 | 10^128668-70000000001 | 128668 | Robert Price | 08/2021 |
| 5787 | 10^128668-350729 | 128668 | Alfred Reich | 08/2024 |
| 5788 | Phi(57476,13#) | 128668 | Henri Lifchitz | 12/2025 |
| 5789 | 2^427420+91 | 128667 | Lelio R Paula | 05/2017 |
| 5790 | 8*10^128651-37 | 128652 | Robert Price | 03/2022 |
| 5791 | (68*10^128645-257)/9 | 128646 | Robert Price | 07/2019 |
| 5792 | Phi(236553,7) | 128631 | Henri Lifchitz | 12/2025 |
| 5793 | 2^427269-113635 | 128621 | Enzo Doria | 08/2014 |
| 5794 | 136^60270+135 | 128589 | Alfred Reich | 03/2026 |
| 5795 | 2^427130+1877569 | 128579 | Enzo Doria | 08/2016 |
| 5796 | 2^427068+20011 | 128561 | Enzo Doria | 06/2023 |
| 5797 | 2^427016-115349 | 128545 | Enzo Doria | 07/2015 |
| 5798 | 2^427001+1334025 | 128541 | Henri Lifchitz | 11/2024 |
| 5799 | (4*10^128510+137)/3 | 128511 | Robert Price | 03/2018 |
| 5800 | 2^426889-112879 | 128507 | Enzo Doria | 06/2014 |
| 5801 | 2^426804+1869931 | 128481 | Enzo Doria | 05/2016 |
| 5802 | 2^426750+77635 | 128465 | Enzo Doria | 05/2016 |
| 5803 | 27708^28913-28913^27708 | 128450 | Frank Doornink | 03/2024 |
| 5804 | 36988^2969+2969^36988 | 128445 | Hans Havermann | 03/2021 |
| 5805 | 36664^3185+3185^36664 | 128439 | Hans Havermann | 03/2021 |
| 5806 | 32618^8649+8649^32618 | 128416 | Hans Havermann | 04/2021 |
| 5807 | 28883^27874+27874^28883 | 128391 | Hans Havermann | 04/2021 |
| 5808 | 2^426425-91 | 128367 | Lelio R Paula | 05/2017 |
| 5809 | (15*2^426398-1)/11 | 128359 | Lelio R Paula | 05/2014 |
| 5810 | 2^426352+74971 | 128345 | Enzo Doria | 04/2016 |
| 5811 | (199*10^128343-7)/3 | 128345 | Robert Price | 05/2020 |
| 5812 | 4*10^128343-21 | 128344 | Robert Price | 09/2018 |
| 5813 | (65*10^128338+493)/9 | 128339 | Robert Price | 08/2021 |
| 5814 | 35632^3997+3997^35632 | 128337 | Hans Havermann | 04/2021 |
| 5815 | 2^426300-1863689 | 128330 | Enzo Doria | 03/2016 |
| 5816 | 2^426293+1881017 | 128327 | Enzo Doria | 11/2016 |
| 5817 | (88*10^128324-637)/9 | 128325 | Robert Price | 11/2020 |
| 5818 | Phi(161347,7) | 128320 | Henri Lifchitz | 12/2025 |
| 5819 | Phi(135199,-9) | 128312 | Henri Lifchitz | 12/2025 |
| 5820 | (491*10^128285+31)/9 | 128287 | Robert Price | 04/2022 |
| 5821 | 39103^1908+1908^39103 | 128281 | Hans Havermann | 04/2021 |
| 5822 | 2^426043+35 | 128252 | Robert Price | 11/2015 |
| 5823 | (4*10^128244-19)/3 | 128245 | Robert Price | 03/2018 |
| 5824 | 26220^29021-29021^26220 | 128234 | Frank Doornink | 03/2024 |
| 5825 | 35489^4102+4102^35489 | 128222 | Hans Havermann | 04/2021 |
| 5826 | 34721^4926+4926^34721 | 128208 | Hans Havermann | 04/2021 |
| 5827 | (305*10^128198+1)/9 | 128200 | Robert Price | 02/2020 |
| 5828 | 2^425808-459959 | 128181 | Enzo Doria | 06/2015 |
| 5829 | 30632^15291+15291^30632 | 128178 | Hans Havermann | 04/2021 |
| 5830 | U(623603) | 128177 | Serge Batalov | 07/2024 |
| 5831 | 35981^3648+3648^35981 | 128167 | Hans Havermann | 04/2021 |
| 5832 | 2^425627-113605 | 128127 | Enzo Doria | 08/2014 |
| 5833 | (4*10^128109+119)/3 | 128110 | Robert Price | 12/2021 |
| 5834 | (22*10^128094+53)/3 | 128095 | Robert Price | 07/2019 |
| 5835 | (86*10^128086-221)/9 | 128087 | Robert Price | 09/2019 |
| 5836 | 18565^30002-30002^18565 | 128070 | Norbert Schneider | 01/2015 |
| 5837 | (2^425287-9)/2737 | 128021 | Lelio R Paula | 05/2015 |
| 5838 | (3*2^425233-1)/25 | 128007 | Lelio R Paula | 05/2014 |
| 5839 | Phi(149401,10)/30037901719561 | 128003 | Makoto Kamada | 07/2022 |
| 5840 | 2^425205+4911 | 128000 | Marek Hubal | 02/2017 |
| 5841 | 29241^23836+23836^29241 | 127995 | Hans Havermann | 04/2021 |
| 5842 | 2^425118-113663 | 127974 | Enzo Doria | 08/2014 |
| 5843 | (86*10^127967-329)/9 | 127968 | Robert Price | 01/2020 |
| 5844 | 2^425061+1869761 | 127957 | Enzo Doria | 05/2016 |
| 5845 | 746^44541+44541^746 | 127955 | Norbert Schneider | 07/2019 |
| 5846 | 30236^17043+17043^30236 | 127946 | Hans Havermann | 03/2021 |
| 5847 | 2^424938+212419 | 127920 | Enzo Doria | 08/2023 |
| 5848 | 2^424918-21141 | 127914 | Enzo Doria | 07/2013 |
| 5849 | Phi(274823,-3) | 127907 | Henri Lifchitz | 12/2025 |
| 5850 | (62*10^127903+91)/9 | 127904 | Robert Price | 07/2021 |
| 5851 | 2^424864-29489 | 127897 | Enzo Doria | 08/2015 |
| 5852 | 30438^15893+15893^30438 | 127877 | Hans Havermann | 02/2021 |
| 5853 | (97*10^127858-1)/3 | 127860 | Serge Batalov | 12/2014 |
| 5854 | 28929^26258+26258^28929 | 127845 | Hans Havermann | 03/2021 |
| 5855 | 30563^15220+15220^30563 | 127828 | Hans Havermann | 03/2021 |
| 5856 | 2^424632-2786639 | 127827 | Enzo Doria | 03/2016 |
| 5857 | 10^127821-700001 | 127821 | Robert Price | 08/2021 |
| 5858 | 2^424577-113755 | 127811 | Enzo Doria | 09/2014 |
| 5859 | (7*2^424512-1)/3 | 127792 | Lelio R Paula | 05/2014 |
| 5860 | (56*10^127752+691)/9 | 127753 | Robert Price | 05/2019 |
| 5861 | 11^122629-720 | 127705 | Enzo Doria | 11/2012 |
| 5862 | 22*10^127645+3 | 127647 | Robert Price | 01/2020 |
| 5863 | 28715^27844+27844^28715 | 127631 | Hans Havermann | 03/2021 |
| 5864 | (56*10^127612+187)/9 | 127613 | Robert Price | 10/2021 |
| 5865 | (5*36^81995+821)/7 | 127609 | Eric Chen | 01/2021 |
| 5866 | 4*10^127562-39 | 127563 | Robert Price | 09/2020 |
| 5867 | 32595^8186+8186^32595 | 127547 | Hans Havermann | 03/2021 |
| 5868 | 2^423696-21429 | 127546 | Enzo Doria | 07/2013 |
| 5869 | 2^423664-1864559 | 127536 | Enzo Doria | 03/2016 |
| 5870 | 37889^2322+2322^37889 | 127530 | Hans Havermann | 03/2021 |
| 5871 | 37668^2429+2429^37668 | 127523 | Hans Havermann | 03/2021 |
| 5872 | 3^267267-4 | 127519 | Henri Lifchitz | 10/2014 |
| 5873 | fibonacci(610144)-2 | 127513 | Jon Grantham | 08/2023 |
| 5874 | 26253^28852-28852^26253 | 127503 | Frank Doornink | 03/2024 |
| 5875 | (103*10^127491+17)/3 | 127493 | Robert Price | 08/2020 |
| 5876 | 29376^21869+21869^29376 | 127487 | Hans Havermann | 03/2021 |
| 5877 | 31186^12241+12241^31186 | 127483 | Hans Havermann | 02/2021 |
| 5878 | (19^99689+5^99689)/24 | 127477 | Robert Price | 09/2013 |
| 5879 | 7239^33023-7238^33023 | 127459 | Norbert Schneider | 02/2026 |
| 5880 | 27069^28754-28754^27069 | 127452 | Frank Doornink | 01/2024 |
| 5881 | (21*2^423372+1)/101 | 127447 | Lelio R Paula | 05/2014 |
| 5882 | 30594^14645+14645^30594 | 127446 | Hans Havermann | 03/2021 |
| 5883 | 2^423328-21537 | 127435 | Enzo Doria | 07/2013 |
| 5884 | (67*10^127413-7)/3 | 127415 | Robert Price | 01/2020 |
| 5885 | (5*34^83193+700233)/11 | 127408 | Eric Chen | 08/2023 |
| 5886 | (2*10^127407+73)/3 | 127407 | Robert Price | 09/2020 |
| 5887 | (2^423165-7)/25 | 127384 | Lelio R Paula | 05/2015 |
| 5888 | (7726^32768+1)/13917994151414876602369 | 127379 | Kellen Shenton | 04/2021 |
| 5889 | (4*10^127349+17)/3 | 127350 | Tyler Busby | 01/2023 |
| 5890 | 29512^20647+20647^29512 | 127341 | Hans Havermann | 03/2021 |
| 5891 | 2^422987-3001935 | 127332 | Paul Bourdelais | 07/2023 |
| 5892 | (112*10^127324+17)/3 | 127326 | Robert Price | 03/2020 |
| 5894 | 29565^20252+20252^29565 | 127321 | Hans Havermann | 03/2021 |
| 5893 | 232^232^232+1831^1831 | 127321 | Henri Lifchitz | 03/2025 |
| 5895 | fibonacci(609165)-3 | 127308 | Jon Grantham | 08/2023 |
| 5897 | (F(5)^182099-F(4)^182099)/F(3) | 127282 | Wayne Halsdorf | 08/2013 |
| 5896 | (5^182099-3^182099)/2 | 127282 | Kellen Shenton | 05/2022 |
| 5898 | (16*10^127259+197)/3 | 127260 | Robert Price | 04/2019 |
| 5899 | (26*10^127240+61)/3 | 127241 | Robert Price | 10/2019 |
| 5900 | (234483*27^88884-145)/26 | 127230 | Curtis Bright | 05/2015 |
| 5901 | 2^422515-114997 | 127190 | Enzo Doria | 06/2015 |
| 5902 | 5*10^127179-3 | 127180 | Robert Price | 07/2015 |
| 5903 | 31678^10343+10343^31678 | 127176 | Hans Havermann | 03/2021 |
| 5904 | (44*10^127169-233)/9 | 127170 | Robert Price | 01/2019 |
| 5905 | 34947^4352+4352^34947 | 127162 | Hans Havermann | 03/2021 |
| 5906 | 6*10^127158+19 | 127159 | Robert Price | 11/2021 |
| 5907 | 30469^14902+14902^30469 | 127155 | Hans Havermann | 03/2021 |
| 5908 | 5*10^127153+77 | 127154 | Robert Price | 12/2018 |
| 5909 | 29941^17620+17620^29941 | 127130 | Hans Havermann | 02/2021 |
| 5910 | 31607^10516+10516^31607 | 127119 | Hans Havermann | 03/2021 |
| 5911 | (19*10^127118-97)/3 | 127119 | Robert Price | 10/2021 |
| 5912 | (29*10^127111+691)/9 | 127112 | Robert Price | 08/2021 |
| 5913 | 736^44335+44335^736 | 127104 | Norbert Schneider | 07/2019 |
| 5914 | 33040^7023+7023^33040 | 127090 | Hans Havermann | 03/2021 |
| 5915 | (4*10^127081+167)/9 | 127081 | Robert Price | 03/2022 |
| 5916 | 29748^18661+18661^29748 | 127052 | Hans Havermann | 03/2021 |
| 5917 | 27905^28578-28578^27905 | 127049 | Frank Doornink | 03/2024 |
| 5918 | -516776642557847117490*Bern(37960)/34256837217082767928421792453 | 127042 | Thomas Ritschel | 06/2017 |
| 5919 | (78^67141-1)/77 | 127036 | Paul Bourdelais | 09/2017 |
| 5920 | (14*10^127014-137)/3 | 127015 | Robert Price | 04/2021 |
| 5921 | 31436^10965+10965^31436 | 127002 | Hans Havermann | 03/2021 |
| 5922 | 28905^24758+24758^28905 | 127001 | Hans Havermann | 03/2021 |
| 5923 | 2^421860-113285 | 126993 | Enzo Doria | 07/2014 |
| 5924 | (10^127030+7)/81234833/9230384921/6092460488946445358851 | 126991 | Alfred Reich | 07/2021 |
| 5925 | (2^421827-7)/11 | 126982 | Lelio R Paula | 05/2015 |
| 5926 | 26268^28729-28729^26268 | 126966 | Frank Doornink | 03/2024 |
| 5927 | 11^121910-840 | 126957 | Enzo Doria | 12/2012 |
| 5928 | (56*10^126935+187)/9 | 126936 | Robert Price | 10/2021 |
| 5929 | 28915^24538+24538^28915 | 126933 | Hans Havermann | 03/2021 |
| 5930 | (29*10^126928-77)/3 | 126929 | Robert Price | 02/2020 |
| 5931 | (259*10^126919-1)/3 | 126921 | Robert Price | 12/2020 |
| 5932 | 10^126919+204567 | 126920 | Patrick De Geest | 05/2021 |
| 5933 | (2^421617+100280245065) | 126920 | Paul Bourdelais | 05/2022 |
| 5934 | 10^126919-100001 | 126919 | Robert Price | 07/2020 |
| 5935 | 28340^28503+28503^28340 | 126907 | Norbert Schneider | 02/2021 |
| 5936 | 2^421534-3001935 | 126895 | Paul Bourdelais | 07/2023 |
| 5937 | (71^68539+1)/72 | 126882 | Paul Bourdelais | 09/2017 |
| 5938 | (5*10^126871-119)/3 | 126872 | Robert Price | 03/2018 |
| 5939 | Phi(47471,561) | 126871 | Henri Lifchitz | 12/2025 |
| 5940 | 331^50339-10004 | 126846 | Enzo Doria | 07/2012 |
| 5941 | 2^421363-2790757 | 126843 | Enzo Doria | 03/2016 |
| 5942 | (106*10^126839-1)/3 | 126841 | Serge Batalov | 12/2014 |
| 5943 | 37938^2203+2203^37938 | 126828 | Hans Havermann | 03/2021 |
| 5944 | (13*10^126819+77)/9 | 126820 | Robert Price | 07/2022 |
| 5945 | (7*2^421243+1)/39 | 126807 | Lelio R Paula | 05/2014 |
| 5947 | (14*10^126784-83)/3 | 126785 | Robert Price | 12/2018 |
| 5946 | 2^421169-3001935 | 126785 | Paul Bourdelais | 07/2023 |
| 5948 | 2^421161-286183 | 126783 | Enzo Doria | 06/2015 |
| 5949 | 26733^28628-28628^26733 | 126738 | Frank Doornink | 03/2024 |
| 5950 | (106*10^126726+17)/3 | 126728 | Robert Price | 04/2021 |
| 5951 | 30718^13347+13347^30718 | 126724 | Hans Havermann | 03/2021 |
| 5952 | 2^420939-113935 | 126716 | Enzo Doria | 10/2014 |
| 5953 | 11*23^93048+356 | 126708 | Eric Chen | 08/2023 |
| 5954 | 177^56363-2 | 126703 | Lelio R Paula | 10/2017 |
| 5955 | 2^420741-113659 | 126656 | Enzo Doria | 08/2014 |
| 5956 | 2^420694-21 | 126642 | Lelio R Paula | 05/2017 |
| 5957 | (13*10^126638+437)/9 | 126639 | Robert Price | 04/2018 |
| 5958 | (167*10^126637-17)/3 | 126639 | Robert Price | 03/2020 |
| 5959 | 4*10^126625+87 | 126626 | Robert Price | 08/2018 |
| 5960 | (31*2^420556+1)/7 | 126601 | Lelio R Paula | 05/2014 |
| 5961 | 7*10^126600-99 | 126601 | Robert Price | 06/2019 |
| 5962 | U(655247)/250330563881/206066063082749 | 126596 | Serge Batalov | 07/2024 |
| 5963 | 2^420424-59189 | 126561 | Enzo Doria | 10/2015 |
| 5964 | 28717^25534+25534^28717 | 126560 | Hans Havermann | 03/2021 |
| 5965 | (86*10^126542+103)/9 | 126543 | Robert Price | 12/2021 |
| 5966 | (19*10^126517-7)/3 | 126518 | Robert Price | 12/2023 |
| 5967 | 2026^38261-2025^38261 | 126516 | Henri Lifchitz | 12/2025 |
| 5968 | 28922^23655+23655^28922 | 126503 | Hans Havermann | 03/2021 |
| 5969 | 2^420126+71893 | 126471 | Enzo Doria | 04/2016 |
| 5970 | 25982^28643-28643^25982 | 126450 | Frank Doornink | 03/2024 |
| 5971 | (43*10^126441+47)/9 | 126442 | Robert Price | 12/2018 |
| 5972 | 8*10^126408+71 | 126409 | Robert Price | 05/2022 |
| 5973 | 2^419866+1877059 | 126393 | Enzo Doria | 07/2016 |
| 5974 | 29315^20484+20484^29315 | 126390 | Hans Havermann | 03/2021 |
| 5975 | 29433^19676+19676^29433 | 126384 | Hans Havermann | 03/2021 |
| 5976 | F(604711) | 126377 | Henri Lifchitz | 02/2005 |
| 5977 | 2^419757+72707 | 126360 | Enzo Doria | 04/2016 |
| 5978 | 2^419720-21569 | 126349 | Enzo Doria | 07/2013 |
| 5979 | 2^419637+29 | 126324 | Henri Lifchitz | 02/2006 |
| 5980 | 31004^11865+11865^31004 | 126319 | Hans Havermann | 03/2021 |
| 5981 | 2^419612+1876741 | 126316 | Enzo Doria | 07/2016 |
| 5982 | 2^419520+2793271 | 126289 | Enzo Doria | 03/2016 |
| 5983 | (2^419447-5)/369 | 126264 | Lelio R Paula | 05/2014 |
| 5984 | 2^419328-1859939 | 126231 | Enzo Doria | 03/2016 |
| 5985 | 2^419282-1851507 | 126217 | Enzo Doria | 08/2015 |
| 5986 | (133*10^126212+17)/3 | 126214 | Robert Price | 11/2021 |
| 5987 | 2^419251+1866143 | 126208 | Enzo Doria | 03/2016 |
| 5988 | 11^121185+2 | 126202 | Robert Price | 05/2014 |
| 5989 | 28203^28352+28352^28203 | 126175 | Norbert Schneider | 01/2021 |
| 5990 | Phi(267889,3) | 126161 | Henri Lifchitz | 12/2025 |
| 5991 | (23*2^419036-1)/1393 | 126141 | Lelio R Paula | 05/2014 |
| 5992 | 2^418851+23 | 126087 | Robert Price | 09/2015 |
| 5993 | (2^418849-9)/2681 | 126083 | Lelio R Paula | 05/2014 |
| 5994 | 2^418829+167 | 126081 | Lelio R Paula | 01/2012 |
| 5995 | 31037^11530+11530^31037 | 126067 | Hans Havermann | 03/2021 |
| 5996 | 4*10^126064-69 | 126065 | Robert Price | 01/2022 |
| 5997 | (31*2^418782-1)/75891 | 126063 | Lelio R Paula | 05/2014 |
| 5998 | (19*2^418754-1)/15 | 126058 | Lelio R Paula | 05/2014 |
| 5999 | (35*10^126048-323)/9 | 126049 | Robert Price | 10/2021 |
| 6000 | 33016^6551+6551^33016 | 126000 | Hans Havermann | 03/2021 |
