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 ? |
| 2751 | 2^554037-2797063 | 166782 | Enzo Doria | 03/2016 |
| 2752 | 31861^37028-37028^31861 | 166747 | Frank Doornink | 01/2024 |
| 2753 | (49*10^166721-139)/9 | 166722 | Robert Price | 03/2019 |
| 2754 | 2*10^166646+69 | 166647 | Robert Price | 06/2020 |
| 2755 | 2^553484-29819 | 166616 | Enzo Doria | 08/2015 |
| 2756 | (188*10^166611+7)/3 | 166613 | Robert Price | 03/2020 |
| 2757 | 2^553383-2784217 | 166585 | Enzo Doria | 10/2015 |
| 2758 | 2^553069+76427 | 166491 | Enzo Doria | 05/2016 |
| 2759 | 25218^37819-37819^25218 | 166469 | Frank Doornink | 12/2023 |
| 2760 | 2*10^166458+51 | 166459 | Robert Price | 05/2018 |
| 2761 | 589^60089-588^60089 | 166454 | Jean-Louis Charton | 09/2012 |
| 2762 | 25214^37799-37799^25214 | 166378 | Frank Doornink | 11/2023 |
| 2763 | 11^159756-2424 | 166369 | Mike Oakes | 06/2010 |
| 2764 | 2^552649-361275 | 166364 | Enzo Doria | 05/2014 |
| 2765 | 2^552628-113669 | 166358 | Enzo Doria | 09/2014 |
| 2766 | (19*10^166325+137)/3 | 166326 | Robert Price | 03/2022 |
| 2767 | 10^166324+550603 | 166325 | Patrick De Geest | 07/2018 |
| 2768 | 10^166324-801 | 166324 | Robert Price | 02/2018 |
| 2769 | (85*10^166297-1)/3 | 166299 | Robert Price | 02/2020 |
| 2770 | (19*10^166280-7)/3 | 166281 | Robert Price | 12/2023 |
| 2771 | 25533^37726-37726^25533 | 166263 | Frank Doornink | 02/2024 |
| 2772 | 8*10^166227+87 | 166228 | Robert Price | 10/2019 |
| 2773 | 2^552137+1879397 | 166210 | Enzo Doria | 09/2016 |
| 2774 | (103*10^166126+11)/3 | 166128 | Robert Price | 01/2021 |
| 2775 | (22*10^166077+179)/3 | 166078 | Robert Price | 02/2022 |
| 2776 | (23^121949-1)/22 | 166061 | Paul Bourdelais | 10/2017 |
| 2777 | 2^551542+19249 | 166031 | Payam Samidoost | 08/2002 |
| 2778 | 2^551535-23821 | 166029 | Enzo Doria | 08/2013 |
| 2779 | 2^551507-23557 | 166021 | Enzo Doria | 08/2013 |
| 2780 | 32030^36841-36841^32030 | 165990 | Frank Doornink | 01/2024 |
| 2781 | 10^165947-7000000001 | 165947 | Robert Price | 12/2021 |
| 2782 | 4*10^165938-47 | 165939 | Robert Price | 10/2021 |
| 2783 | 7*10^165916-3 | 165917 | Robert Price | 08/2015 |
| 2784 | (29*10^165796+67)/3 | 165797 | Robert Price | 12/2019 |
| 2785 | 81^86837-80^86837 | 165728 | Robert Price | 01/2015 |
| 2786 | (71*10^165716-17)/9 | 165717 | Serge Batalov | 01/2023 |
| 2787 | fibonacci(792909)+3 | 165708 | Jon Grantham | 08/2023 |
| 2788 | (71*10^165663-539)/9 | 165664 | Robert Price | 07/2019 |
| 2789 | 25682^37567-37567^25682 | 165657 | Frank Doornink | 02/2024 |
| 2790 | 2^550270-69551 | 165648 | Enzo Doria | 12/2015 |
| 2791 | 2^550250+29329 | 165642 | Enzo Doria | 03/2024 |
| 2792 | (202*10^165569-13)/9 | 165571 | Robert Price | 01/2020 |
| 2793 | 2^550000-23625 | 165567 | Enzo Doria | 08/2013 |
| 2794 | 31688^36783-36783^31688 | 165557 | Frank Doornink | 01/2024 |
| 2795 | 2^549675-1852057 | 165469 | Enzo Doria | 08/2015 |
| 2796 | 2^549663+212543 | 165466 | Enzo Doria | 08/2023 |
| 2797 | (529*10^165394-7)/9 | 165396 | Robert Price | 08/2021 |
| 2798 | 26253^37424-37424^26253 | 165384 | Frank Doornink | 03/2024 |
| 2799 | -tau(103^14938) | 165374 | Nik Lygeros / Olivier Rozier | 10/2013 |
| 2800 | (28*10^165358-1)/9 | 165359 | Serge Batalov | 10/2014 |
| 2801 | 2^549278+1879669 | 165350 | Enzo Doria | 09/2016 |
| 2802 | (7*10^165350-439)/9 | 165350 | Robert Price | 02/2018 |
| 2803 | 2^549252-351269 | 165342 | Enzo Doria | 06/2015 |
| 2804 | 67*10^165327-9 | 165329 | Robert Price | 03/2021 |
| 2806 | (14*10^165282+73)/3 | 165283 | Robert Price | 12/2018 |
| 2805 | (8*10^165283-629)/9 | 165283 | Robert Price | 01/2022 |
| 2807 | 2^549049+2797607 | 165281 | Enzo Doria | 04/2016 |
| 2808 | (218*10^165258+7)/9 | 165260 | Robert Price | 06/2022 |
| 2809 | (7*10^165239+107)/3 | 165240 | Robert Price | 02/2018 |
| 2810 | 2^548880+23961 | 165230 | Enzo Doria | 10/2023 |
| 2811 | 5*2^548778+3 | 165200 | Jon Grantham | 07/2023 |
| 2812 | (44^100511-1)/43 | 165184 | Paul Bourdelais | 11/2017 |
| 2813 | (7*10^165134+107)/3 | 165135 | Robert Price | 02/2018 |
| 2814 | (301*10^165082+23)/9 | 165084 | Robert Price | 06/2021 |
| 2815 | (23*10^165060-83)/3 | 165061 | Robert Price | 08/2019 |
| 2816 | 7*10^165023-27 | 165024 | Robert Price | 11/2022 |
| 2817 | (76*10^164984+77)/9 | 164985 | Robert Price | 10/2019 |
| 2818 | 31058^36715-36715^31058 | 164931 | Frank Doornink | 01/2024 |
| 2819 | (4*10^164929-211)/9 | 164929 | Robert Price | 03/2022 |
| 2820 | 10^164878-500001 | 164878 | Robert Price | 03/2022 |
| 2821 | 9*10^164791-89 | 164792 | Robert Price | 04/2020 |
| 2822 | 2^547178-1856501 | 164717 | Enzo Doria | 10/2015 |
| 2823 | 11^158160-60 | 164707 | Enzo Doria | 07/2012 |
| 2824 | (26*10^164643-167)/3 | 164644 | Robert Price | 10/2019 |
| 2825 | (10^164643+83)/3 | 164643 | Robert Price | 08/2021 |
| 2826 | 2^546398-59201 | 164483 | Enzo Doria | 10/2015 |
| 2827 | 2^546332-114893 | 164463 | Enzo Doria | 05/2015 |
| 2828 | 32003^36504-36504^32003 | 164458 | Frank Doornink | 01/2024 |
| 2829 | (65*10^164427+277)/9 | 164428 | Robert Price | 08/2021 |
| 2830 | 2^545958+1876189 | 164350 | Enzo Doria | 07/2016 |
| 2831 | 2^545878-49841 | 164326 | Enzo Doria | 10/2015 |
| 2832 | (10^164284+77)/3 | 164284 | Robert Price | 01/2018 |
| 2833 | 2^545668-4019 | 164263 | Yves Minet | 04/2017 |
| 2834 | 10^164216+780639 | 164217 | Patrick De Geest | 08/2021 |
| 2836 | 10^164216-50000000001 | 164216 | Robert Price | 12/2020 |
| 2835 | 10^164216-891051 | 164216 | Patrick De Geest | 08/2021 |
| 2837 | (13*53^238539*617^9)/10^247183 | 164151 | Hans Havermann | 07/2017 |
| 2838 | (16*10^164122+197)/3 | 164123 | Robert Price | 04/2019 |
| 2839 | 2^545185+76757 | 164118 | Enzo Doria | 05/2016 |
| 2840 | 2^545076-114329 | 164085 | Enzo Doria | 01/2015 |
| 2841 | (2*10^164043-143)/3 | 164043 | Robert Price | 03/2018 |
| 2842 | (33085^36481-1)/(33085^191-1) | 164018 | Ryan Propper | 11/2023 |
| 2843 | (29^112153+1)/30 | 164011 | Lelio R Paula | 03/2017 |
| 2844 | 2^544757+1874777 | 163989 | Enzo Doria | 06/2016 |
| 2845 | 2^544723+211193 | 163978 | Enzo Doria | 08/2023 |
| 2846 | 2^544444-457199 | 163894 | Enzo Doria | 01/2015 |
| 2847 | (32804^36481-1)/(32804^191-1) | 163883 | Ryan Propper | 11/2023 |
| 2848 | 2^544264-343529 | 163840 | Enzo Doria | 07/2015 |
| 2849 | 7*10^163780+9 | 163781 | Robert Price | 09/2015 |
| 2850 | 2^543989+2793047 | 163758 | Enzo Doria | 02/2016 |
| 2851 | (28*10^163709+113)/3 | 163710 | Robert Price | 03/2020 |
| 2852 | (2013^49729-1)/(2013^223-1) | 163561 | Ryan Propper | 11/2023 |
| 2853 | (23*10^163523+301)/9 | 163524 | Robert Price | 06/2021 |
| 2854 | (68*10^163521-329)/9 | 163522 | Robert Price | 03/2021 |
| 2855 | 35820^35899+35899^35820 | 163489 | Norbert Schneider | 11/2021 |
| 2856 | 2^542870-69551 | 163421 | Enzo Doria | 12/2015 |
| 2857 | 2^542502+24799 | 163310 | Enzo Doria | 10/2023 |
| 2858 | 2^542395+72533 | 163278 | Enzo Doria | 04/2016 |
| 2859 | 2^542258+216949 | 163236 | Enzo Doria | 12/2023 |
| 2860 | 2^542072-3683 | 163180 | Yves Minet | 03/2017 |
| 2861 | fibonacci(780566)-4 | 163129 | Jon Grantham | 08/2023 |
| 2862 | (682*10^163106-7)/9 | 163108 | Robert Price | 08/2021 |
| 2863 | 2^541779-1867357 | 163092 | Enzo Doria | 04/2016 |
| 2864 | (29*10^163056+313)/9 | 163057 | Robert Price | 04/2021 |
| 2865 | 2^541476+214743 | 163001 | Enzo Doria | 11/2023 |
| 2866 | 13^142159+14^142159-2 | 162933 | Harsh Aggarwal | 05/2024 |
| 2867 | 8*10^162924+9 | 162925 | Robert Price | 12/2015 |
| 2868 | 2^540905+81557 | 162829 | Enzo Doria | 08/2016 |
| 2869 | 2^540628-2939 | 162746 | Yves Minet | 09/2014 |
| 2870 | 919^54919-918^54919 | 162743 | Jean-Louis Charton | 01/2013 |
| 2871 | (203*10^162689+1)/3 | 162691 | Robert Price | 03/2020 |
| 2872 | 3*10^162620-59 | 162621 | Robert Price | 09/2018 |
| 2873 | 2^540180+26791 | 162611 | Enzo Doria | 12/2023 |
| 2874 | 3^340694-112960 | 162553 | Enzo Doria | 07/2014 |
| 2875 | 2^539807-114081 | 162499 | Enzo Doria | 12/2014 |
| 2876 | 414^62093+62093^414 | 162498 | Norbert Schneider | 03/2022 |
| 2877 | 2^539654-114893 | 162453 | Enzo Doria | 05/2015 |
| 2878 | 9*10^162449-71 | 162450 | Robert Price | 11/2020 |
| 2879 | 2^539617-1851583 | 162441 | Enzo Doria | 08/2015 |
| 2880 | (509*10^162422+31)/9 | 162424 | Robert Price | 08/2022 |
| 2881 | (91*10^162410+11)/3 | 162412 | Robert Price | 02/2020 |
| 2882 | 2^539346+81049 | 162360 | Enzo Doria | 07/2016 |
| 2883 | 2^539220-115499 | 162322 | Enzo Doria | 07/2015 |
| 2884 | 2^539217-113713 | 162321 | Enzo Doria | 09/2014 |
| 2885 | 9^170099-8^170099 | 162316 | Jean-Louis Charton | 05/2005 |
| 2886 | 4*10^162263-39 | 162264 | Robert Price | 09/2020 |
| 2887 | 31243^36098-36098^31243 | 162252 | Frank Doornink | 01/2024 |
| 2888 | 31987^36000-36000^31987 | 162180 | Frank Doornink | 01/2024 |
| 2889 | (115*10^162153-1)/3 | 162155 | Serge Batalov | 12/2014 |
| 2890 | (10^162138+11)/3 | 162138 | Serge Batalov | 07/2015 |
| 2891 | (61*10^162100-403)/9 | 162101 | Robert Price | 10/2021 |
| 2892 | 2^538473-112723 | 162097 | Enzo Doria | 06/2014 |
| 2893 | 2^538157+79337 | 162002 | Enzo Doria | 06/2016 |
| 2894 | 2^538136-114749 | 161996 | Enzo Doria | 05/2015 |
| 2895 | 2^538104+1531 | 161986 | Lelio R Paula | 01/2013 |
| 2896 | (9*29^110727-1199)/14 | 161927 | Curtis Bright | 05/2015 |
| 2897 | ((2^179294-1)^3+2)/11 | 161918 | Serge Batalov | 03/2023 |
| 2898 | 31198^36027-36027^31198 | 161910 | Frank Doornink | 01/2024 |
| 2899 | 2^537815-22737 | 161899 | Enzo Doria | 07/2013 |
| 2900 | 2^537804-39839 | 161896 | Enzo Doria | 09/2015 |
| 2901 | (754*10^161816-7)/9 | 161818 | Robert Price | 05/2020 |
| 2902 | 2^537461+29867 | 161792 | Enzo Doria | 03/2024 |
| 2903 | 2^537458-59201 | 161791 | Enzo Doria | 10/2015 |
| 2904 | 2*10^161766+51 | 161767 | Robert Price | 05/2018 |
| 2905 | (7*10^161760+131)/3 | 161761 | Robert Price | 06/2020 |
| 2906 | 2^537209-49849 | 161717 | Enzo Doria | 10/2015 |
| 2907 | (58*10^161691+329)/9 | 161692 | Robert Price | 05/2019 |
| 2908 | 23*10^161668-3 | 161670 | Robert Price | 10/2021 |
| 2909 | 2^536937+1879397 | 161635 | Enzo Doria | 09/2016 |
| 2910 | 3*2^536868-5 | 161614 | Jon Grantham | 07/2023 |
| 2911 | 34*10^161593-9 | 161595 | Robert Price | 06/2020 |
| 2912 | (31*10^161582-1)/3 | 161584 | Robert Price | 02/2020 |
| 2913 | 24494^36813+36813^24494 | 161575 | Norbert Schneider | 11/2023 |
| 2914 | 2^536569-22881 | 161524 | Enzo Doria | 07/2013 |
| 2915 | (46*10^161505+593)/9 | 161506 | Robert Price | 04/2022 |
| 2916 | 10^161253+573493 | 161254 | Patrick De Geest | 07/2018 |
| 2917 | 10^161253-8001 | 161253 | Robert Price | 03/2018 |
| 2918 | 97*10^161247-3 | 161249 | Robert Price | 05/2020 |
| 2919 | 7*10^161192-9 | 161193 | Robert Price | 10/2015 |
| 2920 | 2^535415-19 | 161176 | Stefano Morozzi | 07/2022 |
| 2921 | 2^535269-113803 | 161133 | Enzo Doria | 09/2014 |
| 2922 | 2^535205-23295 | 161113 | Enzo Doria | 08/2013 |
| 2923 | (49*10^161105+437)/9 | 161106 | Robert Price | 09/2021 |
| 2924 | (89^82609+1)/90 | 161036 | Paul Bourdelais | 10/2017 |
| 2925 | 2^534429-19 | 160880 | Stefano Morozzi | 07/2022 |
| 2926 | 2^534359-23229 | 160859 | Enzo Doria | 08/2013 |
| 2927 | 10^160836-1001 | 160836 | Robert Price | 10/2022 |
| 2928 | 457^60454+60454^457 | 160803 | Norbert Schneider | 07/2021 |
| 2929 | 8*10^160782+53 | 160783 | Robert Price | 08/2020 |
| 2930 | 67^88037-66^88037 | 160763 | Robert Price | 10/2013 |
| 2931 | (88*10^160761-637)/9 | 160762 | Robert Price | 11/2020 |
| 2932 | 2^533948-1852559 | 160735 | Enzo Doria | 08/2015 |
| 2933 | 2^533665-23335 | 160650 | Enzo Doria | 08/2013 |
| 2934 | 2^533600+217981 | 160630 | Enzo Doria | 01/2024 |
| 2935 | (19*10^160619+77)/3 | 160620 | Robert Price | 05/2019 |
| 2936 | 2^533350-5 | 160555 | Stefano Morozzi | 07/2022 |
| 2937 | (38*10^160508+151)/9 | 160509 | Robert Price | 03/2022 |
| 2938 | 3^336353-2^336353 | 160482 | Mike Oakes | 10/2007 |
| 2939 | 26134^36315-36315^26134 | 160411 | Frank Doornink | 03/2024 |
| 2940 | 25821^36358-36358^25821 | 160411 | Frank Doornink | 03/2024 |
| 2941 | 2*10^160339-63 | 160340 | Robert Price | 01/2022 |
| 2942 | 24419^36532+36532^24419 | 160293 | Norbert Schneider | 10/2023 |
| 2943 | (91*10^160249+11)/3 | 160251 | Robert Price | 02/2020 |
| 2944 | (772*10^160239-7)/9 | 160241 | Robert Price | 06/2022 |
| 2945 | (2*10^160226+187)/9 | 160226 | Robert Price | 06/2022 |
| 2946 | 2^532253+1868417 | 160225 | Enzo Doria | 04/2016 |
| 2947 | 2^532108-291989 | 160181 | Enzo Doria | 07/2015 |
| 2948 | (28*10^160171-79)/3 | 160172 | Robert Price | 02/2021 |
| 2949 | (26*10^160166-131)/3 | 160167 | Robert Price | 10/2019 |
| 2950 | 55*10^160145+9 | 160147 | Robert Price | 03/2022 |
| 2951 | (17*10^160143+67)/3 | 160144 | Robert Price | 01/2019 |
| 2952 | (394^61637-1)/393 | 159977 | Jinyuan Wang | 04/2023 |
| 2953 | (19*10^159921-49)/3 | 159922 | Robert Price | 05/2019 |
| 2954 | 2^531110-1853771 | 159881 | Enzo Doria | 09/2015 |
| 2955 | (275^65536+53^65536)/2 | 159864 | Kellen Shenton | 11/2020 |
| 2956 | 2^530992-1845299 | 159845 | Enzo Doria | 07/2015 |
| 2957 | 2^530810+25 | 159790 | Stefano Morozzi | 04/2021 |
| 2958 | 25590^36241-36241^25590 | 159753 | Frank Doornink | 02/2024 |
| 2959 | (136*10^159736-1)/9 | 159738 | Serge Batalov | 12/2014 |
| 2960 | 2^530417-113833 | 159672 | Enzo Doria | 09/2014 |
| 2961 | 2^530406-69701 | 159669 | Enzo Doria | 02/2016 |
| 2962 | 5*10^159656+41 | 159657 | Robert Price | 03/2019 |
| 2963 | 8*10^159614+29 | 159615 | Robert Price | 11/2021 |
| 2964 | 7^188858-188858^7 | 159604 | Norbert Schneider | 05/2018 |
| 2965 | 28^110278+27 | 159590 | Alfred Reich | 02/2024 |
| 2966 | 7*10^159553-27 | 159554 | Robert Price | 11/2022 |
| 2967 | 3^334409-5*2^334409 | 159554 | Jon Grantham | 08/2023 |
| 2968 | (24^115597-1)/23 | 159547 | Paul Bourdelais | 09/2017 |
| 2969 | 25472^36209-36209^25472 | 159540 | Frank Doornink | 01/2024 |
| 2970 | (17*10^159438-377)/9 | 159439 | Robert Price | 03/2018 |
| 2971 | (203*10^159381+1)/3 | 159383 | Robert Price | 03/2020 |
| 2972 | 32282^35343-35343^32282 | 159361 | Frank Doornink | 02/2024 |
| 2973 | 2^529215+219383 | 159310 | Enzo Doria | 02/2024 |
| 2974 | 89*10^159258-9 | 159260 | Robert Price | 05/2020 |
| 2975 | 2^528944-461315 | 159229 | Enzo Doria | 07/2015 |
| 2976 | (13*10^159147+161)/3 | 159148 | Robert Price | 11/2018 |
| 2977 | 2^528620-113879 | 159131 | Enzo Doria | 10/2014 |
| 2978 | 32125^35306-35306^32125 | 159119 | Frank Doornink | 02/2024 |
| 2979 | (47*10^159083+259)/9 | 159084 | Robert Price | 03/2022 |
| 2980 | (861^54181-1)/860 | 159019 | Jinyuan Wang | 11/2023 |
| 2981 | 2^528000-23307 | 158944 | Enzo Doria | 08/2013 |
| 2982 | (29*10^158909+61)/9 | 158910 | Robert Price | 08/2018 |
| 2983 | 2^527817+1876817 | 158889 | Enzo Doria | 07/2016 |
| 2984 | 2^527774-49451 | 158876 | Enzo Doria | 10/2015 |
| 2985 | 2^527745-291553 | 158868 | Enzo Doria | 07/2015 |
| 2986 | (91*10^158862+11)/3 | 158864 | Robert Price | 02/2020 |
| 2987 | 2^527644-1856999 | 158837 | Enzo Doria | 10/2015 |
| 2988 | (37200^37199-37198^37199)/(2^37199) | 158822 | Henri Lifchitz | 06/2013 |
| 2989 | (17*10^158819+7)/3 | 158820 | Robert Price | 06/2023 |
| 2990 | 2^527573-1863253 | 158816 | Enzo Doria | 12/2015 |
| 2991 | 2^527553-23401 | 158810 | Enzo Doria | 08/2013 |
| 2992 | (49*10^158783+437)/9 | 158784 | Robert Price | 09/2021 |
| 2993 | 10^158755+310207 | 158756 | Patrick De Geest | 08/2021 |
| 2994 | 10^158755-50001 | 158755 | Robert Price | 08/2020 |
| 2995 | (61*10^158748-619)/9 | 158749 | Robert Price | 03/2022 |
| 2996 | 11^152420-210 | 158730 | Enzo Doria | 09/2012 |
| 2997 | (13*10^158694+401)/9 | 158695 | Robert Price | 01/2018 |
| 2998 | 2^527052-69059 | 158659 | Enzo Doria | 11/2015 |
| 2999 | 2^526849-113233 | 158598 | Enzo Doria | 07/2014 |
| 3000 | 24286^36161+36161^24286 | 158579 | Norbert Schneider | 08/2023 |
