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 ? |
1501 | (21996^57121-1)/(21996^239-1) | 247002 | Ryan Propper | 11/2023 |
1502 | 2^820356+7 | 246952 | Jon Grantham | 08/2023 |
1503 | 2^820077+382847 | 246868 | Enzo Doria | 11/2016 |
1504 | 2^820001+81269 | 246845 | Enzo Doria | 07/2016 |
1505 | 2^819463-59197 | 246683 | Enzo Doria | 10/2015 |
1506 | 2^819296+80581 | 246633 | Enzo Doria | 07/2016 |
1507 | 2^818764+21573 | 246473 | Enzo Doria | 11/2023 |
1508 | 2^817852+215491 | 246198 | Enzo Doria | 11/2023 |
1509 | 2^817160-350369 | 245990 | Enzo Doria | 06/2015 |
1510 | 2^816039-19 | 245653 | Stefano Morozzi | 07/2022 |
1511 | 2^816029+219407 | 245650 | Enzo Doria | 02/2024 |
1512 | (71*10^245558-17)/9 | 245559 | Serge Batalov | 01/2023 |
1513 | 5*3^514648+2^514648 | 245551 | Jon Grantham | 08/2023 |
1514 | 88093#+(653879#)/(88093#) | 245374 | Makoto Morimoto | 11/2017 |
1515 | 2^815111-113857 | 245373 | Enzo Doria | 10/2014 |
1516 | (34555^54289-1)/(34555^233-1) | 245334 | Ryan Propper | 11/2023 |
1517 | 2^814914-4001 | 245314 | Yves Minet | 05/2017 |
1518 | 846^83761-845^83761 | 245200 | Jean-Louis Charton | 12/2012 |
1519 | 2^814356-2790449 | 245146 | Enzo Doria | 12/2015 |
1520 | 2^814276-459029 | 245122 | Enzo Doria | 04/2015 |
1521 | 2^814023+180923 | 245046 | Enzo Doria | 07/2016 |
1522 | 2^813496+216751 | 244887 | Enzo Doria | 12/2023 |
1523 | (3^513059-2^513059)/(1026119*5430216457) | 244776 | Mike Oakes | 03/2017 |
1524 | 3^513007+16 | 244767 | Robert Price | 04/2020 |
1525 | (46^147197-31^147197)/15 | 244752 | Aurel Gibier | 06/2024 |
1526 | 2^811882+27289 | 244401 | Enzo Doria | 12/2023 |
1527 | 2^811842-113675 | 244389 | Enzo Doria | 09/2014 |
1528 | 2^811132-2787929 | 244176 | Enzo Doria | 11/2015 |
1529 | 2^809746-2790971 | 243758 | Enzo Doria | 01/2016 |
1530 | (14*10^243724-197)/3 | 243725 | Robert Price | 03/2023 |
1531 | 2^808767-3295 | 243464 | Yves Minet | 12/2016 |
1532 | 2^808621-113809 | 243420 | Enzo Doria | 09/2014 |
1533 | 2^808199+29693 | 243293 | Enzo Doria | 03/2024 |
1534 | 2^807724+1879621 | 243150 | Enzo Doria | 09/2016 |
1535 | 2^807417+217787 | 243057 | Enzo Doria | 01/2024 |
1536 | (23*10^242909+91)/3 | 242910 | Robert Price | 03/2023 |
1537 | 2^806708+20371 | 242844 | Enzo Doria | 08/2023 |
1538 | 2*10^242822-91 | 242823 | Robert Price | 02/2023 |
1539 | 20^186554-3 | 242713 | Paul Bourdelais | 12/2020 |
1540 | 2^805843-113611 | 242583 | Enzo Doria | 08/2014 |
1541 | 2^805745-459763 | 242554 | Enzo Doria | 05/2015 |
1542 | 2^805353+782687 | 242436 | Enzo Doria | 11/2016 |
1543 | (19*10^242362-7)/3 | 242363 | Robert Price | 12/2023 |
1544 | 2^804895+29963 | 242298 | Enzo Doria | 03/2024 |
1545 | 2^804725+28229 | 242247 | Enzo Doria | 01/2024 |
1546 | 6^311257+5 | 242206 | Paul Bourdelais | 02/2021 |
1547 | 2^804277-417933 | 242112 | Enzo Doria | 01/2014 |
1548 | 2^803468-269039 | 241868 | Enzo Doria | 10/2013 |
1549 | 2^803172+80851 | 241779 | Enzo Doria | 07/2016 |
1550 | 2^803011+220073 | 241731 | Enzo Doria | 03/2024 |
1551 | 3^506233-2 | 241535 | Robert Price | 11/2013 |
1552 | 2^802025-25999 | 241434 | Enzo Doria | 10/2013 |
1553 | (3^505823+3^252912+1)/7 | 241339 | Serge Batalov | 03/2014 |
1554 | 2^801575+25073 | 241299 | Enzo Doria | 11/2023 |
1555 | 2^801303+1872923 | 241217 | Enzo Doria | 05/2016 |
1556 | 2^801105+216977 | 241157 | Enzo Doria | 12/2023 |
1557 | (23*10^241048-143)/3 | 241049 | Robert Price | 12/2023 |
1558 | 2^800579-1862947 | 240999 | Enzo Doria | 12/2015 |
1559 | 2^799999+16205 | 240824 | Norman Luhn | 09/2023 |
1560 | 3^504206+2 | 240568 | Luke W. Richards | 03/2018 |
1561 | 2^798973-26283 | 240515 | Enzo Doria | 10/2013 |
1562 | 2^798671-69487 | 240424 | Enzo Doria | 12/2015 |
1563 | 2^797220+79831 | 239988 | Enzo Doria | 06/2016 |
1564 | 2^796910-26001 | 239894 | Enzo Doria | 10/2013 |
1565 | 2^796598+653119 | 239800 | Enzo Doria | 12/2016 |
1566 | 2^796432-1859729 | 239750 | Enzo Doria | 11/2015 |
1567 | 2^796002-1852211 | 239621 | Enzo Doria | 08/2015 |
1568 | 2^795884+214081 | 239585 | Enzo Doria | 10/2023 |
1569 | 2^795709+75767 | 239533 | Enzo Doria | 04/2016 |
1570 | 2^795708+81721 | 239532 | Enzo Doria | 08/2016 |
1571 | 2^795468-2786249 | 239460 | Enzo Doria | 10/2015 |
1572 | 2^795442+80779 | 239452 | Enzo Doria | 07/2016 |
1573 | 2^795075-1852057 | 239342 | Enzo Doria | 08/2015 |
1574 | (86^123677+1)/87 | 239252 | Paul Bourdelais | 01/2019 |
1575 | 2^794043+1875023 | 239031 | Enzo Doria | 06/2016 |
1576 | 2^793347-69577 | 238822 | Enzo Doria | 01/2016 |
1577 | 5*2^793288+3 | 238805 | Jon Grantham | 07/2023 |
1578 | 2^792988-344429 | 238714 | Enzo Doria | 08/2015 |
1579 | 2^792700-2786369 | 238627 | Enzo Doria | 11/2015 |
1580 | 2^792663-1844797 | 238616 | Enzo Doria | 06/2015 |
1581 | 2^792605-291943 | 238598 | Enzo Doria | 07/2015 |
1582 | 2^792366+218599 | 238526 | Enzo Doria | 01/2024 |
1583 | (2^792061-2^396031+1)/5 | 238434 | Thomas Ritschel | 03/2014 |
1584 | 2^791321+30077 | 238212 | Enzo Doria | 03/2024 |
1585 | 4*10^238163+21 | 238164 | Robert Price | 12/2022 |
1586 | (26*10^238157-77)/3 | 238158 | Robert Price | 03/2023 |
1587 | 10^237670+9 | 237671 | Robert Price | 08/2023 |
1588 | 2^789373+1869377 | 237625 | Enzo Doria | 05/2016 |
1589 | ((10^59387+1)^3*(10^59387+1+10^29694)-(10^118774+10^59387)*(10^29694-1)+10^178161)/27961 | 237544 | Serge Batalov | 04/2015 |
1590 | 2^789033+218537 | 237523 | Enzo Doria | 01/2024 |
1591 | 2^788942+1866409 | 237496 | Enzo Doria | 02/2016 |
1592 | 2^788844-114329 | 237466 | Enzo Doria | 01/2015 |
1593 | 2^788705-1859713 | 237424 | Enzo Doria | 11/2015 |
1594 | 2^788325+224789 | 237310 | Enzo Doria | 07/2024 |
1595 | 15^201475+14 | 236953 | Alfred Reich | 10/2023 |
1596 | 2^786663+219173 | 236810 | Enzo Doria | 02/2024 |
1597 | 2^786180+1871971 | 236664 | Enzo Doria | 05/2016 |
1598 | 11^227092-90 | 236492 | Enzo Doria | 11/2012 |
1599 | 2^785260+1866361 | 236387 | Enzo Doria | 02/2016 |
1600 | 2^785220+1880611 | 236375 | Enzo Doria | 10/2016 |
1601 | (2^784689-15)/7 | 236215 | Stefano Morozzi | 08/2022 |
1602 | 19^184650-2 | 236122 | Robert Price | 10/2014 |
1603 | 10^236059+216513 | 236060 | Patrick De Geest | 04/2016 |
1604 | 10^236059-20909 | 236059 | Robert Price | 09/2015 |
1605 | 2^783893-21 | 235976 | Stefano Morozzi | 07/2022 |
1606 | 2^782821+37577 | 235653 | Enzo Doria | 10/2024 |
1607 | (87^121487-1)/86 | 235625 | Paul Bourdelais | 12/2018 |
1608 | 2^782634-113981 | 235597 | Enzo Doria | 11/2014 |
1609 | 2^782423+1879733 | 235533 | Enzo Doria | 09/2016 |
1610 | (10^(2*117707+1)+12*10^117707-1)/3 | 235415 | Robert Price | 10/2023 |
1611 | 2^781682-2789543 | 235310 | Enzo Doria | 12/2015 |
1612 | 2^780481+21489 | 234949 | Enzo Doria | 05/2024 |
1613 | 2^780408-113453 | 234927 | Enzo Doria | 08/2014 |
1614 | 7*10^234915+9 | 234916 | Robert Price | 04/2023 |
1615 | 2^780368-1864829 | 234915 | Enzo Doria | 01/2016 |
1616 | 2^780284+7 | 234889 | Jon Grantham | 08/2023 |
1617 | 2^779593-1836559 | 234681 | Enzo Doria | 05/2015 |
1618 | (8713#+(549391#)/(8713#))/360295171 | 234487 | Makoto Morimoto | 11/2017 |
1619 | (5^335429+1)/6 | 234455 | Paul Bourdelais | 08/2010 |
1620 | 2^778788+22201 | 234439 | Enzo Doria | 09/2023 |
1621 | 2^778395-113617 | 234321 | Enzo Doria | 08/2014 |
1622 | 5*2^778090+3 | 234230 | Jon Grantham | 07/2023 |
1623 | (21430^54289-1)/(21430^233-1) | 234118 | Ryan Propper | 11/2023 |
1624 | (5*10^234054-101)/3 | 234055 | Robert Price | 08/2023 |
1625 | 23*10^234025-7 | 234027 | Robert Price | 10/2022 |
1626 | 2^777170+21489 | 233952 | Enzo Doria | 05/2024 |
1627 | Phi(78125,5517) | 233857 | Anonymous | 09/2022 |
1628 | 5^334359-3^334359-1 | 233707 | Jon Grantham | 08/2023 |
1629 | 2^776245-2792353 | 233674 | Enzo Doria | 02/2016 |
1630 | 2^776060-114029 | 233618 | Enzo Doria | 11/2014 |
1631 | 2^775987-2789557 | 233596 | Enzo Doria | 12/2015 |
1632 | 2*10^233564-91 | 233565 | Robert Price | 02/2023 |
1633 | 2^775865+21489 | 233559 | Enzo Doria | 05/2024 |
1634 | 2^775672+1866721 | 233501 | Enzo Doria | 03/2016 |
1635 | 2^775238+57 | 233370 | Stefano Morozzi | 05/2021 |
1636 | (11^223999+1)/12 | 233270 | Paul Bourdelais | 02/2010 |
1637 | U(1302049) | 233238 | Serge Batalov | 07/2024 |
1638 | 2^774118+1885789 | 233033 | Enzo Doria | 04/2017 |
1639 | 21^176191-20^176191 | 232964 | Jean-Louis Charton | 01/2015 |
1640 | 2^773723+217523 | 232914 | Enzo Doria | 01/2024 |
1641 | 2^773679-113425 | 232901 | Enzo Doria | 08/2014 |
1642 | (7*10^232620+23)/3 | 232621 | Robert Price | 05/2023 |
1643 | 10^232599+192489 | 232600 | Patrick De Geest | 12/2013 |
1644 | 10^232599-3 | 232599 | Markus Tervooren | 10/2010 |
1645 | 2^772552-458879 | 232562 | Enzo Doria | 04/2015 |
1646 | 2^772214+1874899 | 232460 | Enzo Doria | 06/2016 |
1647 | 2^771994-1862771 | 232394 | Enzo Doria | 12/2015 |
1648 | 2^771889+1876037 | 232362 | Enzo Doria | 07/2016 |
1649 | 2^771660+1866511 | 232293 | Enzo Doria | 02/2016 |
1650 | 5^332150-18188 | 232163 | Enzo Doria | 06/2014 |
1651 | 2^771227+61121 | 232163 | Boyan Hu | 05/2024 |
1652 | 2^770623+212543 | 231981 | Enzo Doria | 09/2023 |
1653 | 3^485977-2^485977 | 231870 | Mike Oakes | 09/2009 |
1654 | 2^770082-114161 | 231818 | Enzo Doria | 01/2015 |
1655 | 2^769791+25523 | 231731 | Enzo Doria | 11/2023 |
1656 | 7^274120-2 | 231659 | Paul Bourdelais | 08/2023 |
1657 | (20^177967+1)/21 | 231540 | Paul Bourdelais | 05/2013 |
1658 | (4*10^231254+23)/9 | 231254 | Serge Batalov | 11/2022 |
1659 | 2^768205+22217 | 231253 | Enzo Doria | 09/2023 |
1660 | 2^767622-9221 | 231078 | Lelio R Paula | 01/2016 |
1661 | 2^767344+1880311 | 230994 | Enzo Doria | 09/2016 |
1662 | 8*10^230921-13 | 230922 | Robert Price | 08/2023 |
1663 | (3^483611-1)/2 | 230741 | Paul Bourdelais | 02/2010 |
1664 | (10^230706+179)/9 | 230706 | Serge Batalov | 12/2014 |
1665 | 2^766309+1875257 | 230682 | Enzo Doria | 06/2016 |
1666 | (26131^52441-1)/(26131^229-1) | 230629 | Ryan Propper | 11/2023 |
1667 | 2^765635+1879883 | 230480 | Enzo Doria | 09/2016 |
1668 | 43^141090+141090 | 230467 | Kellen Shenton | 06/2023 |
1669 | (26*10^230394-119)/3 | 230395 | Robert Price | 07/2023 |
1670 | 2^764348-113697 | 230092 | Enzo Doria | 09/2014 |
1671 | 2^764131+78863 | 230027 | Enzo Doria | 05/2016 |
1672 | 2^763701+60197 | 229897 | Enzo Doria | 03/2016 |
1673 | 4*10^229836+21 | 229837 | Robert Price | 12/2022 |
1674 | 2^763362+27799 | 229795 | Enzo Doria | 01/2024 |
1675 | 2^762841-25905 | 229639 | Enzo Doria | 10/2013 |
1676 | 2^762659+212633 | 229584 | Enzo Doria | 09/2023 |
1677 | 77*10^229211+3 | 229213 | Robert Price | 11/2023 |
1678 | 2^761117-113569 | 229120 | Enzo Doria | 08/2014 |
1679 | (29022^51529-1)/(29022^227-1) | 228947 | Ryan Propper | 11/2023 |
1680 | (98^114859+1)/99 | 228709 | Paul Bourdelais | 12/2018 |
1681 | 5*3^479067-2^479067 | 228574 | Jon Grantham | 08/2023 |
1682 | 2^758645+216011 | 228375 | Enzo Doria | 12/2023 |
1683 | (2^758231+1)/(3*27146942976539*73236839266867) | 228223 | Gord Palameta | 12/2018 |
1684 | (298*10^228177-7)/3 | 228179 | Robert Price | 02/2023 |
1685 | 2^757985-2790013 | 228177 | Enzo Doria | 12/2015 |
1686 | 34*10^228129-9 | 228131 | Robert Price | 05/2023 |
1687 | 2^757038-1862081 | 227892 | Enzo Doria | 12/2015 |
1688 | 2^756839+95849 | 227832 | Makoto Morimoto | 10/2013 |
1690 | (2^756839+6989)/756091 | 227826 | Makoto Morimoto | 09/2016 |
1689 | (2^756839-50211)/(137*3203) | 227826 | Makoto Morimoto | 08/2019 |
1691 | 2^756773-112723 | 227812 | Enzo Doria | 07/2014 |
1692 | (7*10^(2*113887+1)+9*10^113887-7)/9 | 227775 | Robert Price | 08/2024 |
1693 | 524309#+616367 | 227431 | Makoto Morimoto | 02/2016 |
1694 | 2^755404+226575 | 227400 | Enzo Doria | 09/2024 |
1695 | 2^755097-114193 | 227307 | Enzo Doria | 12/2014 |
1696 | 7*10^227178+39 | 227179 | Robert Price | 01/2023 |
1697 | 9*10^227153-89 | 227154 | Robert Price | 02/2023 |
1698 | 2^754473-2791513 | 227120 | Enzo Doria | 01/2016 |
1699 | 2^754376+25 | 227090 | Stefano Morozzi | 05/2021 |
1700 | 2^754138+213289 | 227019 | Enzo Doria | 09/2023 |
1701 | 2^754038+25 | 226989 | Stefano Morozzi | 05/2021 |
1702 | 2^753263+217133 | 226755 | Enzo Doria | 12/2023 |
1703 | 7*10^226479-9 | 226480 | Robert Price | 02/2023 |
1704 | 2^751655+33893 | 226271 | Enzo Doria | 06/2024 |
1705 | 2^751426-764321 | 226202 | Enzo Doria | 12/2013 |
1706 | (18^180181-1)/17 | 226176 | Andy Steward | 04/2007 |
1707 | 2^750740-3 | 225996 | Paul Bourdelais | 03/2012 |
1708 | 2^750725+60227 | 225991 | Enzo Doria | 02/2016 |
1709 | 2^750525-113743 | 225931 | Enzo Doria | 09/2014 |
1710 | (2^750151-1)/(429934042631*7590093831289*397764574647511*8361437834787151*17383638888678527263) | 225744 | Dario Alpern | 10/2014 |
1711 | 2^749444-1861889 | 225606 | Enzo Doria | 12/2015 |
1712 | tau(311^16452) | 225560 | Nik Lygeros / Olivier Rozier / LR team | 10/2013 |
1713 | 2^749096+1876861 | 225501 | Enzo Doria | 07/2016 |
1714 | 2^748895+26213 | 225440 | Enzo Doria | 12/2023 |
1715 | (519643#+43033)/(23*1871*2706283) | 225379 | Makoto Morimoto | 08/2019 |
1716 | 2^748657+79607 | 225369 | Enzo Doria | 06/2016 |
1717 | (2^746920-11)/5 | 224845 | Stefano Morozzi | 08/2022 |
1718 | 2^746653-291583 | 224765 | Enzo Doria | 07/2015 |
1719 | 2^746461-114043 | 224708 | Enzo Doria | 11/2014 |
1720 | 2^746302+25 | 224660 | Stefano Morozzi | 05/2021 |
1721 | (202*10^224545-1)/3 | 224547 | Robert Price | 06/2023 |
1722 | (19*10^224533-37)/9 | 224534 | Alfred Reich | 12/2023 |
1723 | 2^745674+213949 | 224471 | Enzo Doria | 10/2023 |
1724 | 2^745098-350471 | 224297 | Enzo Doria | 06/2015 |
1725 | 2^745039-4897 | 224280 | Yves Minet | 03/2021 |
1726 | 23*10^224232-7 | 224234 | Robert Price | 10/2022 |
1727 | (154*10^224061-1)/9 | 224063 | Serge Batalov | 12/2014 |
1728 | 2^744211-1845787 | 224030 | Enzo Doria | 07/2015 |
1729 | 2^743773+37757 | 223898 | Enzo Doria | 10/2024 |
1730 | 2^743592-134579 | 223844 | Hans Havermann | 10/2018 |
1731 | 2^742452+3 | 223501 | Paul Bourdelais | 06/2019 |
1732 | 234178^9+9^234178 | 223463 | Anatoly F. Selevich | 07/2011 |
1733 | 47747^47747-2512^2512 | 223406 | Henri Lifchitz | 10/2024 |
1734 | 2^741651-461197 | 223260 | Enzo Doria | 07/2015 |
1735 | 10^223236-1001 | 223236 | Robert Price | 10/2022 |
1736 | 2^741362-1845251 | 223173 | Enzo Doria | 07/2015 |
1737 | 3^467546-5*2^467546 | 223077 | Jon Grantham | 08/2023 |
1738 | 2^740455-1863877 | 222900 | Enzo Doria | 12/2015 |
1739 | 2^740274+217519 | 222845 | Enzo Doria | 01/2024 |
1740 | (14*10^222718-41)/9 | 222719 | Serge Batalov | 01/2023 |
1741 | 2^739636-2792219 | 222653 | Enzo Doria | 02/2016 |
1742 | 11^213654-180 | 222498 | Enzo Doria | 01/2013 |
1743 | 2^738957-1859743 | 222449 | Enzo Doria | 11/2015 |
1744 | 4*10^222253-21 | 222254 | Robert Price | 12/2022 |
1745 | 2^737825+57 | 222108 | Stefano Morozzi | 05/2021 |
1746 | (54^128189+1)/55 | 222073 | Paul Bourdelais | 11/2018 |
1747 | 2^737166+220099 | 221910 | Enzo Doria | 03/2024 |
1748 | (10^221654+179)/9 | 221654 | Serge Batalov | 12/2014 |
1749 | 2^736281+79817 | 221643 | Enzo Doria | 06/2016 |
1750 | 10^221631+247617 | 221632 | Patrick De Geest | 10/2013 |