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 ? |
| 5251 | (29^91493-3^91493)/26 | 133798 | Robert Price | 06/2025 |
| 5252 | (2276213*2^444444+1)/3 | 133797 | Alex_soldier | 11/2022 |
| 5253 | (1403559*2^444444+1)/5 | 133797 | Alex_soldier | 11/2022 |
| 5254 | (1209887*2^444444+1)/9 | 133797 | Alex_soldier | 11/2022 |
| 5255 | (608239*2^444444+1)/25 | 133796 | Alex_soldier | 11/2022 |
| 5256 | (1824587*2^444444+1)/27 | 133796 | Alex_soldier | 11/2022 |
| 5257 | (40795*2^444444+1)/7 | 133795 | Alex_soldier | 11/2022 |
| 5258 | 30739^22458+22458^30739 | 133757 | Hans Havermann | 04/2021 |
| 5259 | 34942^6721+6721^34942 | 133739 | Hans Havermann | 04/2021 |
| 5260 | (3^280229-1)/1120918 | 133698 | Aurel Gibier | 03/2025 |
| 5261 | (2^444046+100280245065) | 133672 | Paul Bourdelais | 05/2022 |
| 5262 | 34792^6935+6935^34792 | 133638 | Hans Havermann | 04/2021 |
| 5263 | (266*10^133603+1)/3 | 133605 | Robert Price | 04/2020 |
| 5264 | 32261^13842+13842^32261 | 133600 | Hans Havermann | 04/2021 |
| 5265 | (89*10^133580+1)/9 | 133581 | Serge Batalov | 05/2010 |
| 5266 | (134*10^133573-11)/3 | 133575 | Robert Price | 01/2022 |
| 5267 | 26726^30173-30173^26726 | 133574 | Frank Doornink | 03/2024 |
| 5268 | 2^443721+39527 | 133574 | Enzo Doria | 11/2024 |
| 5269 | 62^74521-61^74521 | 133571 | Robert Price | 05/2013 |
| 5270 | (182*10^133543+1)/3 | 133545 | Robert Price | 02/2020 |
| 5271 | (103*10^133535+11)/3 | 133537 | Robert Price | 01/2021 |
| 5272 | 32589^12520+12520^32589 | 133537 | Hans Havermann | 03/2021 |
| 5273 | L(638839)/274700771 | 133502 | Serge Batalov | 07/2024 |
| 5274 | 34516^7373+7373^34516 | 133496 | Hans Havermann | 04/2021 |
| 5275 | 8*10^133487-37 | 133488 | Robert Price | 03/2022 |
| 5276 | 30135^26882+26882^30135 | 133482 | Hans Havermann | 04/2021 |
| 5277 | 2^443198-1867301 | 133416 | Enzo Doria | 03/2016 |
| 5278 | 27^93192+26 | 133392 | Anonymous | 09/2024 |
| 5279 | (19*10^133390+101)/3 | 133391 | Robert Price | 09/2019 |
| 5280 | (71^72043-1)/70 | 133369 | Paul Bourdelais | 09/2017 |
| 5281 | (17508!^2+1)/(1453817*25094393) | 133366 | Michael Porter | 09/2025 |
| 5282 | 36117^4910+4910^36117 | 133311 | Hans Havermann | 04/2021 |
| 5283 | 2^442799+1874633 | 133296 | Enzo Doria | 06/2016 |
| 5284 | L(637751) | 133283 | Henri Lifchitz | 09/2008 |
| 5285 | 109^65410-2 | 133269 | Lelio R Paula | 10/2017 |
| 5286 | 2^442688-113489 | 133263 | Enzo Doria | 08/2014 |
| 5287 | (7*2^442640-1)/783 | 133246 | Lelio R Paula | 07/2015 |
| 5288 | (9*2^442463+1)/17441 | 133192 | Lelio R Paula | 07/2015 |
| 5289 | 2^442437-1849993 | 133187 | Enzo Doria | 08/2015 |
| 5290 | 2^442430-2791721 | 133185 | Enzo Doria | 03/2016 |
| 5291 | (13*2^442428-1)/309 | 133183 | Lelio R Paula | 07/2015 |
| 5292 | 29959^27870+27870^29959 | 133172 | Hans Havermann | 03/2021 |
| 5293 | (25*2^442379-1)/71 | 133169 | Lelio R Paula | 07/2015 |
| 5294 | 2^442368+213691 | 133167 | Enzo Doria | 09/2023 |
| 5295 | 34240^7737+7737^34240 | 133145 | Hans Havermann | 03/2021 |
| 5296 | 452^50145+50145^452 | 133142 | Norbert Schneider | 09/2020 |
| 5297 | (355^52201-1)/354 | 133122 | Tom Wu | 08/2024 |
| 5298 | (3^278981-1)/14507014 | 133101 | Paul Vanderveen | 05/2025 |
| 5299 | 30659^21796+21796^30659 | 133011 | Hans Havermann | 04/2021 |
| 5300 | 33276^9935+9935^33276 | 133010 | Hans Havermann | 04/2021 |
| 5301 | 30111^26122+26122^30111 | 133001 | Hans Havermann | 04/2021 |
| 5302 | 30790^20869+20869^30790 | 132998 | Hans Havermann | 04/2021 |
| 5304 | (2^441799+78557)/5 | 132995 | Lelio R Paula | 07/2015 |
| 5303 | 8*10^132994-27 | 132995 | Robert Price | 10/2021 |
| 5305 | (109*10^132992+11)/3 | 132994 | Robert Price | 06/2022 |
| 5306 | 2^441781-2787883 | 132990 | Enzo Doria | 03/2016 |
| 5307 | fibonacci(636232)+4 | 132965 | Jon Grantham | 08/2023 |
| 5308 | (3*2^441685+1)/749 | 132959 | Lelio R Paula | 07/2015 |
| 5309 | 2^441618+37 | 132941 | Lelio R Paula | 08/2017 |
| 5310 | 34857^6514+6514^34857 | 132940 | Hans Havermann | 04/2021 |
| 5311 | 34065^7988+7988^34065 | 132937 | Hans Havermann | 04/2021 |
| 5312 | 35571^5452+5452^35571 | 132914 | Hans Havermann | 04/2021 |
| 5313 | 2^441521-113575 | 132912 | Enzo Doria | 08/2014 |
| 5314 | 7*10^132884-99 | 132885 | Robert Price | 06/2019 |
| 5315 | 26987^29988-29988^26987 | 132882 | Frank Doornink | 03/2024 |
| 5316 | (103*10^132879+17)/3 | 132881 | Robert Price | 08/2020 |
| 5317 | 2^441396-65 | 132874 | Lelio R Paula | 08/2017 |
| 5318 | 33350^9633+9633^33350 | 132859 | Hans Havermann | 04/2021 |
| 5319 | 2^441330+1871959 | 132854 | Enzo Doria | 05/2016 |
| 5320 | 25772^30111-30111^25772 | 132825 | Frank Doornink | 02/2024 |
| 5321 | 2^441063+383 | 132774 | Lelio R Paula | 06/2012 |
| 5322 | (10^132753+7)/17/19 | 132751 | Alfred Reich | 06/2021 |
| 5323 | (22*10^132746+53)/3 | 132747 | Robert Price | 07/2019 |
| 5324 | (77*10^132744-149)/9 | 132745 | Robert Price | 03/2022 |
| 5325 | (22*10^132732+119)/3 | 132733 | Robert Price | 04/2021 |
| 5326 | 2^440846+1870909 | 132708 | Enzo Doria | 05/2016 |
| 5327 | (948^44579-1)/947 | 132701 | Jinyuan Wang | 04/2023 |
| 5328 | 2^440656-113489 | 132651 | Enzo Doria | 08/2014 |
| 5329 | numbpart(14180123587) | 132646 | Serge Batalov | 04/2017 |
| 5330 | 32950^10591+10591^32950 | 132622 | Hans Havermann | 04/2021 |
| 5331 | 33302^9597+9597^33302 | 132614 | Hans Havermann | 04/2021 |
| 5332 | (19*10^132550+191)/3 | 132551 | Robert Price | 05/2019 |
| 5333 | (2^440399-1)/(16210820281161978209*31518475633*880799) | 132538 | Dario Alpern | 01/2015 |
| 5334 | (38^83891+1)/39 | 132529 | Robert Price | 09/2013 |
| 5335 | 2*10^132493-43 | 132494 | Robert Price | 04/2018 |
| 5336 | 31352^16809+16809^31352 | 132480 | Hans Havermann | 04/2021 |
| 5337 | (418*10^132441+23)/9 | 132443 | Robert Price | 02/2020 |
| 5338 | 2^439931-21 | 132433 | Lelio R Paula | 08/2017 |
| 5339 | 47^79201-46^79201 | 132432 | Robert Price | 10/2012 |
| 5340 | 2^439897-113653 | 132423 | Enzo Doria | 08/2014 |
| 5341 | 35505^5362+5362^35505 | 132410 | Hans Havermann | 03/2021 |
| 5342 | 30079^25222+25222^30079 | 132402 | Hans Havermann | 04/2021 |
| 5343 | (5*2^439822+1)/9 | 132400 | Lelio R Paula | 06/2015 |
| 5344 | (695*10^132356+7)/9 | 132358 | Robert Price | 12/2021 |
| 5345 | (112*10^132337-1)/3 | 132339 | Serge Batalov | 12/2014 |
| 5346 | 2^439576-113247 | 132326 | Enzo Doria | 07/2014 |
| 5347 | (7^156589-1)/65346468774 | 132323 | Paul Vanderveen | 05/2025 |
| 5348 | 30059^25230+25230^30059 | 132318 | Hans Havermann | 04/2021 |
| 5349 | 2^439497-29143 | 132302 | Enzo Doria | 07/2015 |
| 5350 | 2^439409-114193 | 132276 | Enzo Doria | 12/2014 |
| 5351 | (39^83137+2^83137)/41 | 132275 | Robert Price | 12/2024 |
| 5352 | (44*10^132233-233)/9 | 132234 | Robert Price | 01/2019 |
| 5353 | 25507^30000-30000^25507 | 132200 | Frank Doornink | 02/2024 |
| 5354 | 9*10^132148-7 | 132149 | Robert Price | 09/2015 |
| 5355 | V(790390) | 132144 | Serge Batalov | 07/2024 |
| 5356 | (47*10^132125-119)/9 | 132126 | Robert Price | 05/2019 |
| 5357 | 2^438900+214051 | 132123 | Enzo Doria | 10/2023 |
| 5358 | 2^438845+1870217 | 132106 | Enzo Doria | 05/2016 |
| 5359 | 2^438789+87855 | 132089 | Lelio R Paula | 01/2016 |
| 5360 | 2^438774-2786411 | 132085 | Enzo Doria | 03/2016 |
| 5361 | 2^438755-1848205 | 132079 | Enzo Doria | 07/2015 |
| 5362 | 30502^21381+21381^30502 | 132075 | Hans Havermann | 04/2021 |
| 5363 | 2^438739-112087 | 132074 | Enzo Doria | 06/2014 |
| 5364 | (588859*29^90289-19)/28 | 132043 | Eric Chen | 06/2025 |
| 5365 | (2^438438+100280245065) | 131983 | Paul Bourdelais | 05/2022 |
| 5366 | 35872^4777+4777^35872 | 131979 | Hans Havermann | 04/2021 |
| 5367 | 31198^16945+16945^31198 | 131938 | Hans Havermann | 03/2021 |
| 5368 | 13907#+(318259#)/(13907#) | 131923 | Makoto Morimoto | 10/2017 |
| 5369 | L(631181) | 131910 | Henri Lifchitz | 09/2008 |
| 5370 | (47*10^131886-119)/9 | 131887 | Robert Price | 05/2019 |
| 5371 | 5*2^438096-3 | 131881 | Jon Grantham | 07/2023 |
| 5372 | (3*2^438121+1)/4308193883 | 131879 | Lelio R Paula | 06/2015 |
| 5373 | 2^438079-1863877 | 131875 | Enzo Doria | 03/2016 |
| 5374 | (16*10^131872-37)/3 | 131873 | Robert Price | 05/2021 |
| 5375 | (2^438067+5)/329 | 131869 | Lelio R Paula | 06/2015 |
| 5376 | 2^437908-113855 | 131824 | Enzo Doria | 09/2014 |
| 5377 | 2^437884-286349 | 131817 | Enzo Doria | 07/2015 |
| 5378 | 15^112072+14 | 131807 | Alfred Reich | 10/2023 |
| 5379 | 5^188558+4 | 131797 | Tyler NeSmith | 05/2021 |
| 5380 | (11*10^131784-17)/3 | 131785 | Robert Price | 06/2018 |
| 5381 | (166^59357-1)/165 | 131777 | Anonymous | 06/2024 |
| 5383 | 4*10^131719-93 | 131720 | Robert Price | 07/2020 |
| 5382 | 31629^14606+14606^31629 | 131720 | Hans Havermann | 04/2021 |
| 5384 | 3^276062-112292 | 131716 | Enzo Doria | 07/2014 |
| 5385 | 2^437539+2025 | 131713 | Henri Lifchitz | 01/2025 |
| 5386 | 11*31^88313+322688 | 131708 | Eric Chen | 05/2024 |
| 5387 | (7*10^131682+89)/3 | 131683 | Robert Price | 08/2020 |
| 5388 | 29512^28969+28969^29512 | 131681 | Hans Havermann | 03/2021 |
| 5389 | 2^437343+75953 | 131654 | Enzo Doria | 04/2016 |
| 5390 | 35^85243-34^85243 | 131621 | Robert Price | 05/2012 |
| 5391 | (28*10^131586+59)/3 | 131587 | Robert Price | 05/2021 |
| 5392 | (59*10^131575+391)/9 | 131576 | Robert Price | 03/2021 |
| 5393 | 39984^1945+1945^39984 | 131505 | Hans Havermann | 03/2021 |
| 5394 | 25842^29801-29801^25842 | 131492 | Frank Doornink | 03/2024 |
| 5395 | 28592^29505-29505^28592 | 131482 | Frank Doornink | 05/2024 |
| 5396 | 25647^29818-29818^25647 | 131469 | Frank Doornink | 02/2024 |
| 5397 | (203*10^131457+1)/3 | 131459 | Robert Price | 03/2020 |
| 5398 | 7*10^131421-41 | 131422 | Robert Price | 08/2021 |
| 5399 | 87309^32+32^87309 | 131414 | Hans Havermann | 03/2021 |
| 5400 | (68^71713+1)/69 | 131413 | Paul Bourdelais | 09/2017 |
| 5401 | 2^436521+224885 | 131406 | Enzo Doria | 07/2024 |
| 5402 | (650*10^131391+43)/9 | 131393 | Tyler Busby | 01/2023 |
| 5403 | 2^436451+1884713 | 131385 | Enzo Doria | 03/2017 |
| 5404 | 2^436365+35 | 131359 | Robert Price | 11/2015 |
| 5406 | 2^436300+1866871 | 131340 | Enzo Doria | 03/2016 |
| 5405 | (7*10^131339+179)/3 | 131340 | Robert Price | 09/2018 |
| 5407 | 14^114592-3 | 131338 | Paul Bourdelais | 12/2020 |
| 5408 | 36197^4236+4236^36197 | 131285 | Hans Havermann | 04/2021 |
| 5409 | (37*10^131270+341)/9 | 131271 | Robert Price | 08/2018 |
| 5410 | 29863^24790+24790^29863 | 131227 | Hans Havermann | 03/2021 |
| 5411 | (5*10^131223-29)/3 | 131224 | Robert Price | 03/2018 |
| 5412 | 29524^27825+27825^29524 | 131218 | Hans Havermann | 03/2021 |
| 5413 | (23*2^435891-1)/699 | 131215 | Lelio R Paula | 07/2015 |
| 5414 | (11*2^435879+1)/3337 | 131211 | Lelio R Paula | 06/2015 |
| 5415 | 30639^19136+19136^30639 | 131192 | Hans Havermann | 04/2021 |
| 5416 | (2^435808+1)/641/6700417 | 131182 | Lelio R Paula | 02/2012 |
| 5417 | (2^435808+1)/4294967297 | 131182 | Serge Batalov | 12/2016 |
| 5418 | 2^435773+1875557 | 131181 | Enzo Doria | 06/2016 |
| 5419 | (16*10^131180+167)/3 | 131181 | Robert Price | 06/2019 |
| 5420 | (26*10^131180-77)/3 | 131181 | Robert Price | 11/2019 |
| 5421 | (25*10^131144-7)/9 | 131145 | Robert Price | 05/2018 |
| 5422 | 29299^29358-29358^29299 | 131138 | Norbert Schneider | 03/2022 |
| 5423 | 2^435612-2789939 | 131133 | Enzo Doria | 12/2015 |
| 5424 | 33976^7231+7231^33976 | 131121 | Hans Havermann | 03/2021 |
| 5425 | 33715^7746+7746^33715 | 131121 | Hans Havermann | 03/2021 |
| 5426 | 66^72047-65^72047 | 131093 | Robert Price | 09/2013 |
| 5427 | (5*10^131090+37)/3 | 131091 | Robert Price | 03/2018 |
| 5428 | 2^435468+75631 | 131089 | Enzo Doria | 04/2016 |
| 5429 | 37^83588-2 | 131083 | Lelio R Paula | 08/2015 |
| 5430 | (4^217720+11)/3 | 131081 | Robert Price | 02/2017 |
| 5431 | 30407^20448+20448^30407 | 131074 | Hans Havermann | 04/2021 |
| 5432 | (22*10^131070+179)/3 | 131071 | Robert Price | 02/2022 |
| 5433 | 28831^29388-29388^28831 | 131067 | Frank Doornink | 05/2024 |
| 5434 | 29487^27836+27836^29487 | 131059 | Hans Havermann | 04/2021 |
| 5435 | 29962^23615+23615^29962 | 131030 | Hans Havermann | 03/2021 |
| 5436 | 2^435202-113193 | 131009 | Enzo Doria | 07/2014 |
| 5437 | 41705^1384+1384^41705 | 131002 | Hans Havermann | 04/2021 |
| 5438 | 9*10^130998-19 | 130999 | Robert Price | 07/2019 |
| 5439 | 36243^4108+4108^36243 | 130969 | Hans Havermann | 04/2021 |
| 5440 | (445^49433+1)/446 | 130914 | Jinyuan Wang | 05/2024 |
| 5441 | floor((sqrt(5)-1)/2*10^130911) | 130911 | Serge Batalov | 06/2017 |
| 5442 | 2^434835-111937 | 130899 | Enzo Doria | 05/2014 |
| 5443 | (62*10^130895-629)/9 | 130896 | Robert Price | 07/2021 |
| 5444 | 2^434807+225 | 130890 | Henri Lifchitz | 11/2024 |
| 5445 | 2^434685+72257 | 130854 | Enzo Doria | 04/2016 |
| 5446 | (7*10^130825+113)/3 | 130826 | Robert Price | 02/2018 |
| 5447 | 2^434539-29317 | 130810 | Enzo Doria | 07/2015 |
| 5448 | (74*10^130791+637)/9 | 130792 | Robert Price | 01/2022 |
| 5449 | 2^434469-114259 | 130789 | Enzo Doria | 01/2015 |
| 5450 | (5*10^130763+103)/9 | 130763 | Robert Price | 04/2022 |
| 5451 | 2^434246+33 | 130722 | Robert Price | 11/2015 |
| 5452 | 30156^21599+21599^30156 | 130710 | Hans Havermann | 04/2021 |
| 5453 | (41^81041-3^81041)/38 | 130701 | Robert Price | 09/2025 |
| 5454 | (17*10^130695-161)/9 | 130696 | Robert Price | 02/2021 |
| 5455 | 30513^19148+19148^30513 | 130661 | Hans Havermann | 03/2021 |
| 5456 | 29736^24761+24761^29736 | 130654 | Hans Havermann | 04/2021 |
| 5457 | 9*10^130638+41 | 130639 | Robert Price | 08/2020 |
| 5458 | 2^433911-91 | 130621 | Lelio R Paula | 06/2017 |
| 5459 | 30786^17449+17449^30786 | 130588 | Hans Havermann | 03/2021 |
| 5460 | 2^433744-114419 | 130570 | Enzo Doria | 02/2015 |
| 5462 | 2^433708+1869451 | 130560 | Enzo Doria | 05/2016 |
| 5461 | 2^433710+93 | 130560 | Lelio R Paula | 06/2017 |
| 5463 | 7*10^130535-27 | 130536 | Robert Price | 11/2022 |
| 5464 | (17^130533)%(10^130533) | 130533 | Henri Lifchitz | 05/2025 |
| 5465 | (9629^32768+1)/120501441265666 | 130520 | Kellen Shenton | 05/2021 |
| 5466 | 804*34^85220+713 | 130516 | Eric Chen | 08/2023 |
| 5467 | (29*2^433547-1)/27 | 130511 | Lelio R Paula | 06/2015 |
| 5468 | 3^273521+10 | 130503 | Tyler NeSmith | 01/2021 |
| 5469 | 41659^1356+1356^41659 | 130487 | Hans Havermann | 03/2021 |
| 5470 | 4*10^130480+9 | 130481 | Robert Price | 05/2015 |
| 5471 | (23*2^433449-1)/75 | 130481 | Lelio R Paula | 06/2015 |
| 5472 | 3*2^433422+5 | 130474 | Jon Grantham | 07/2023 |
| 5473 | (23*2^433334-1)/3731 | 130445 | Lelio R Paula | 06/2015 |
| 5474 | (31*10^130414-49)/9 | 130415 | Robert Price | 11/2021 |
| 5475 | 26462^29485-29485^26462 | 130402 | Frank Doornink | 03/2024 |
| 5476 | 33481^7848+7848^33481 | 130401 | Hans Havermann | 03/2021 |
| 5477 | (17*10^130393+7)/3 | 130394 | Robert Price | 06/2023 |
| 5478 | (22*10^130392+203)/9 | 130393 | Robert Price | 10/2021 |
| 5479 | 29773^23950+23950^29773 | 130386 | Hans Havermann | 04/2021 |
| 5480 | 2^433023-113497 | 130353 | Enzo Doria | 08/2014 |
| 5481 | 31175^15178+15178^31175 | 130350 | Hans Havermann | 04/2021 |
| 5482 | 2^433002+1179379 | 130347 | Enzo Doria | 06/2016 |
| 5483 | 2^432974+19 | 130339 | Robert Price | 08/2015 |
| 5484 | 31903^12168+12168^31903 | 130331 | Hans Havermann | 04/2021 |
| 5485 | 2^432917+22217 | 130322 | Enzo Doria | 09/2023 |
| 5486 | 29387^27112+27112^29387 | 130278 | Hans Havermann | 04/2021 |
| 5487 | 2^432768+213181 | 130277 | Enzo Doria | 09/2023 |
| 5488 | 29577^25370+25370^29577 | 130267 | Hans Havermann | 04/2021 |
| 5489 | 31738^12685+12685^31738 | 130231 | Hans Havermann | 03/2021 |
| 5490 | 44235^878+878^44235 | 130206 | Hans Havermann | 04/2021 |
| 5491 | 32160^11171+11171^32160 | 130187 | Hans Havermann | 04/2021 |
| 5492 | 29489^25956+25956^29489 | 130172 | Hans Havermann | 04/2021 |
| 5493 | (2^432457-1)/1672739247834685086279697 | 130159 | Tony Prest / Never Odd Or Even | 09/2013 |
| 5494 | 33005^8766+8766^33005 | 130133 | Hans Havermann | 04/2021 |
| 5495 | (35*10^130132-611)/9 | 130133 | Robert Price | 02/2022 |
| 5496 | (444^49408+1)/(444^256+1) | 130125 | Martin Hopf | 12/2023 |
| 5497 | 2^432217+41 | 130111 | Lelio R Paula | 06/2017 |
| 5498 | (2^216089*(2^216091-1)-339)/25 | 130098 | Makoto Morimoto | 03/2017 |
| 5499 | ((2^216091+1066)^2+(2^216091+1066)+41)/47/2069 | 130095 | Makoto Morimoto | 05/2016 |
| 5500 | 97^65480-2 | 130094 | Lelio R Paula | 05/2017 |
