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 ? |
| 2501 | 2^675211-198405 | 203259 | Stefano Morozzi | 04/2025 |
| 2502 | 2^675209+1791 | 203259 | Stefano Morozzi | 09/2025 |
| 2503 | 2^675208-131505 | 203258 | Stefano Morozzi | 04/2025 |
| 2504 | 2^675206+131877 | 203258 | Stefano Morozzi | 09/2025 |
| 2505 | 2^675208+97257 | 203258 | Stefano Morozzi | 09/2025 |
| 2506 | 2^675202-14823 | 203257 | Stefano Morozzi | 04/2025 |
| 2507 | 2^675202-35967 | 203257 | Stefano Morozzi | 04/2025 |
| 2508 | 2^675202-54681 | 203257 | Stefano Morozzi | 04/2025 |
| 2509 | 2^675205-107845 | 203257 | Stefano Morozzi | 04/2025 |
| 2510 | 2^675199-131397 | 203256 | Stefano Morozzi | 04/2025 |
| 2511 | 2^675199-34219 | 203256 | Stefano Morozzi | 04/2025 |
| 2512 | 2^675199-56175 | 203256 | Stefano Morozzi | 04/2025 |
| 2513 | 2^675200+100045 | 203256 | Stefano Morozzi | 09/2025 |
| 2514 | 2^675198-106925 | 203255 | Stefano Morozzi | 04/2025 |
| 2515 | 2^675196+191491 | 203255 | Stefano Morozzi | 09/2025 |
| 2516 | 2^675198+5289 | 203255 | Stefano Morozzi | 09/2025 |
| 2517 | 2^675192-192243 | 203254 | Stefano Morozzi | 04/2025 |
| 2518 | 2^675192+36871 | 203254 | Stefano Morozzi | 09/2025 |
| 2519 | 2^675195+174711 | 203254 | Stefano Morozzi | 09/2025 |
| 2520 | 2^675189-37383 | 203253 | Stefano Morozzi | 04/2025 |
| 2521 | 2^675190-68711 | 203253 | Stefano Morozzi | 04/2025 |
| 2522 | 2^675191-114549 | 203253 | Stefano Morozzi | 04/2025 |
| 2523 | 2^675191-29445 | 203253 | Stefano Morozzi | 04/2025 |
| 2524 | 2^675189+16221 | 203253 | Stefano Morozzi | 08/2025 |
| 2525 | 2^675190+43477 | 203253 | Stefano Morozzi | 08/2025 |
| 2526 | 2^675186-24563 | 203252 | Stefano Morozzi | 04/2025 |
| 2527 | 2^675187-185041 | 203252 | Stefano Morozzi | 04/2025 |
| 2528 | 2^675188-121613 | 203252 | Stefano Morozzi | 04/2025 |
| 2529 | 2^675188+103585 | 203252 | Stefano Morozzi | 08/2025 |
| 2530 | 2^675183-43587 | 203251 | Stefano Morozzi | 04/2025 |
| 2531 | 2^675184-60563 | 203251 | Stefano Morozzi | 04/2025 |
| 2532 | 2^675182+128499 | 203251 | Stefano Morozzi | 08/2025 |
| 2533 | 2^675185+11 | 203251 | Stefano Morozzi | 08/2025 |
| 2534 | 10247^50678-50678^10247 | 203250 | Norbert Schneider | 03/2022 |
| 2535 | 2^675179+85311 | 203250 | Stefano Morozzi | 08/2025 |
| 2536 | 2^675177-30495 | 203249 | Stefano Morozzi | 04/2025 |
| 2537 | 2^675176+161467 | 203249 | Stefano Morozzi | 08/2025 |
| 2538 | 2^675178+15745 | 203249 | Stefano Morozzi | 08/2025 |
| 2539 | 2^675172+24927 | 203248 | Stefano Morozzi | 08/2025 |
| 2540 | 2^675170-170651 | 203247 | Stefano Morozzi | 04/2025 |
| 2541 | 2^675171-21231 | 203247 | Stefano Morozzi | 04/2025 |
| 2542 | 2^675169+107577 | 203247 | Stefano Morozzi | 08/2025 |
| 2543 | 2^675171+159551 | 203247 | Stefano Morozzi | 08/2025 |
| 2544 | 2^675166-116351 | 203246 | Stefano Morozzi | 04/2025 |
| 2545 | 2^675166-63465 | 203246 | Stefano Morozzi | 04/2025 |
| 2546 | 2^675167-11047 | 203246 | Stefano Morozzi | 04/2025 |
| 2547 | 2^675168-197307 | 203246 | Stefano Morozzi | 04/2025 |
| 2548 | 2^675168-89379 | 203246 | Stefano Morozzi | 04/2025 |
| 2549 | 2^675166+23097 | 203246 | Stefano Morozzi | 07/2025 |
| 2550 | 2^675167+7725 | 203246 | Stefano Morozzi | 07/2025 |
| 2551 | 2^675167+35999 | 203246 | Stefano Morozzi | 07/2025 |
| 2552 | 2^675162-24471 | 203245 | Stefano Morozzi | 04/2025 |
| 2553 | 2^675163-4971 | 203245 | Stefano Morozzi | 04/2025 |
| 2554 | 2^675163-69489 | 203245 | Stefano Morozzi | 04/2025 |
| 2555 | 2^675165-153541 | 203245 | Stefano Morozzi | 04/2025 |
| 2556 | 2^675159-107809 | 203244 | Stefano Morozzi | 04/2025 |
| 2557 | 2^675160+107463 | 203244 | Stefano Morozzi | 07/2025 |
| 2558 | 2^675160+174355 | 203244 | Stefano Morozzi | 07/2025 |
| 2559 | 2^675156-156785 | 203243 | Stefano Morozzi | 04/2025 |
| 2560 | 2^675157-177433 | 203243 | Stefano Morozzi | 04/2025 |
| 2561 | 2^675154-66563 | 203242 | Stefano Morozzi | 04/2025 |
| 2562 | 2^675153+21477 | 203242 | Stefano Morozzi | 07/2025 |
| 2563 | 2^675153+88607 | 203242 | Stefano Morozzi | 07/2025 |
| 2564 | 2^675154+7609 | 203242 | Stefano Morozzi | 07/2025 |
| 2565 | 2^675155+128255 | 203242 | Stefano Morozzi | 07/2025 |
| 2566 | 2^675148-71007 | 203240 | Stefano Morozzi | 04/2025 |
| 2567 | 2^675148-94815 | 203240 | Stefano Morozzi | 04/2025 |
| 2568 | 2^675146+28957 | 203240 | Stefano Morozzi | 06/2025 |
| 2569 | 2^675143+55865 | 203239 | Stefano Morozzi | 06/2025 |
| 2570 | 2^675143+100619 | 203239 | Stefano Morozzi | 06/2025 |
| 2571 | 2^675143+191895 | 203239 | Stefano Morozzi | 06/2025 |
| 2572 | 2^675144+34207 | 203239 | Stefano Morozzi | 06/2025 |
| 2573 | 2^675142+160903 | 203238 | Stefano Morozzi | 06/2025 |
| 2574 | 2^675138-52371 | 203237 | Stefano Morozzi | 04/2025 |
| 2575 | 2^675138+114979 | 203237 | Stefano Morozzi | 06/2025 |
| 2576 | 2^675133-7273 | 203236 | Stefano Morozzi | 04/2025 |
| 2577 | 2^675134-73473 | 203236 | Stefano Morozzi | 04/2025 |
| 2578 | 2^675129+146825 | 203235 | Stefano Morozzi | 06/2025 |
| 2579 | 2^675131+198275 | 203235 | Stefano Morozzi | 06/2025 |
| 2580 | 2^675132+156585 | 203235 | Stefano Morozzi | 06/2025 |
| 2581 | 2^675124-51675 | 203233 | Stefano Morozzi | 04/2025 |
| 2582 | 2^675124+3907 | 203233 | Stefano Morozzi | 06/2025 |
| 2583 | 2^675124+58711 | 203233 | Stefano Morozzi | 06/2025 |
| 2584 | 2^675124+115557 | 203233 | Stefano Morozzi | 06/2025 |
| 2585 | 2^675120-40809 | 203232 | Stefano Morozzi | 04/2025 |
| 2586 | 2^675120-50573 | 203232 | Stefano Morozzi | 04/2025 |
| 2587 | 2^675122+185715 | 203232 | Stefano Morozzi | 06/2025 |
| 2588 | 2^675116-109889 | 203231 | Stefano Morozzi | 04/2025 |
| 2589 | 2^675116+90607 | 203231 | Stefano Morozzi | 06/2025 |
| 2590 | 2^675113+69461 | 203230 | Stefano Morozzi | 06/2025 |
| 2591 | 2^675110+147825 | 203229 | Stefano Morozzi | 06/2025 |
| 2592 | 2^675110+179107 | 203229 | Stefano Morozzi | 06/2025 |
| 2593 | 2^675106-73241 | 203228 | Stefano Morozzi | 02/2025 |
| 2594 | 2^675103-188727 | 203227 | Stefano Morozzi | 02/2025 |
| 2595 | 2^675104-16199 | 203227 | Stefano Morozzi | 02/2025 |
| 2596 | 2^675104-195303 | 203227 | Stefano Morozzi | 02/2025 |
| 2597 | 2^675105-94521 | 203227 | Stefano Morozzi | 02/2025 |
| 2598 | 2^675103+31599 | 203227 | Stefano Morozzi | 04/2025 |
| 2599 | 2^675103+124629 | 203227 | Stefano Morozzi | 06/2025 |
| 2600 | 2^675100-2775 | 203226 | Stefano Morozzi | 02/2025 |
| 2601 | 2^675098-170703 | 203225 | Stefano Morozzi | 02/2025 |
| 2602 | 2^675097+50651 | 203225 | Stefano Morozzi | 04/2025 |
| 2603 | 2^675093-162123 | 203224 | Stefano Morozzi | 02/2025 |
| 2604 | 2^675093-48955 | 203224 | Stefano Morozzi | 02/2025 |
| 2605 | 2^675095-73591 | 203224 | Stefano Morozzi | 02/2025 |
| 2606 | 2^675095-89937 | 203224 | Stefano Morozzi | 02/2025 |
| 2607 | 2^675093+87767 | 203224 | Stefano Morozzi | 04/2025 |
| 2608 | Phi(220603,-9) | 203224 | Henri Lifchitz | 12/2025 |
| 2609 | 2^675092-144539 | 203223 | Stefano Morozzi | 02/2025 |
| 2610 | 2^675090+92253 | 203223 | Stefano Morozzi | 04/2025 |
| 2611 | 2^675086-186387 | 203222 | Stefano Morozzi | 02/2025 |
| 2612 | 2^675088-68505 | 203222 | Stefano Morozzi | 02/2025 |
| 2613 | 2^675083-149199 | 203221 | Stefano Morozzi | 02/2025 |
| 2614 | 2^675081-91425 | 203220 | Stefano Morozzi | 02/2025 |
| 2615 | 2^675082-80213 | 203220 | Stefano Morozzi | 02/2025 |
| 2616 | 2^675080+112651 | 203220 | Stefano Morozzi | 04/2025 |
| 2617 | 2^675082+25435 | 203220 | Stefano Morozzi | 04/2025 |
| 2618 | 2^675082+180613 | 203220 | Stefano Morozzi | 04/2025 |
| 2619 | 2^675077-152683 | 203219 | Stefano Morozzi | 02/2025 |
| 2620 | 2^675077-79213 | 203219 | Stefano Morozzi | 02/2025 |
| 2621 | 2^675077+172221 | 203219 | Stefano Morozzi | 04/2025 |
| 2622 | 2^675073-149065 | 203218 | Stefano Morozzi | 02/2025 |
| 2623 | 2^675073-19663 | 203218 | Stefano Morozzi | 02/2025 |
| 2624 | 2^675074+25755 | 203218 | Stefano Morozzi | 04/2025 |
| 2625 | 2^675075+151203 | 203218 | Stefano Morozzi | 04/2025 |
| 2626 | 2^675069-147135 | 203217 | Stefano Morozzi | 02/2025 |
| 2627 | 2^675069-161461 | 203217 | Stefano Morozzi | 02/2025 |
| 2628 | 2^675071-175189 | 203217 | Stefano Morozzi | 02/2025 |
| 2629 | 2^675071+105575 | 203217 | Stefano Morozzi | 04/2025 |
| 2630 | 2^675071+162299 | 203217 | Stefano Morozzi | 04/2025 |
| 2631 | 2^675067+124541 | 203216 | Stefano Morozzi | 04/2025 |
| 2632 | 2^675068+163695 | 203216 | Stefano Morozzi | 04/2025 |
| 2633 | 2^675064+116445 | 203215 | Stefano Morozzi | 04/2025 |
| 2634 | 2^675065+26045 | 203215 | Stefano Morozzi | 04/2025 |
| 2635 | 2^675060+119983 | 203214 | Stefano Morozzi | 02/2025 |
| 2636 | 2^675060+161301 | 203214 | Stefano Morozzi | 02/2025 |
| 2637 | 2^675061-187773 | 203214 | Stefano Morozzi | 02/2025 |
| 2638 | 2^675062-92193 | 203214 | Stefano Morozzi | 02/2025 |
| 2639 | 2^675058-10403 | 203213 | Stefano Morozzi | 01/2025 |
| 2640 | 2^675058-40337 | 203213 | Stefano Morozzi | 01/2025 |
| 2641 | 2^675057+123557 | 203213 | Stefano Morozzi | 02/2025 |
| 2642 | 2^675057+172475 | 203213 | Stefano Morozzi | 02/2025 |
| 2643 | 2^675053-4801 | 203212 | Stefano Morozzi | 01/2025 |
| 2644 | 2^675054-174341 | 203212 | Stefano Morozzi | 01/2025 |
| 2645 | 2^675054-53697 | 203212 | Stefano Morozzi | 01/2025 |
| 2646 | 2^675054+24825 | 203212 | Stefano Morozzi | 02/2025 |
| 2647 | 2^675055+160265 | 203212 | Stefano Morozzi | 02/2025 |
| 2648 | 2^675050-30015 | 203211 | Stefano Morozzi | 01/2025 |
| 2649 | 2^675051-85941 | 203211 | Stefano Morozzi | 01/2025 |
| 2650 | 2^675051+30885 | 203211 | Stefano Morozzi | 02/2025 |
| 2651 | 2^675052+12537 | 203211 | Stefano Morozzi | 02/2025 |
| 2652 | 2^675047-100299 | 203210 | Stefano Morozzi | 01/2025 |
| 2653 | 2^675048-97313 | 203210 | Stefano Morozzi | 01/2025 |
| 2654 | 2^675046+118119 | 203210 | Stefano Morozzi | 02/2025 |
| 2655 | 2^675048+128941 | 203210 | Stefano Morozzi | 02/2025 |
| 2656 | 2^675049+136359 | 203210 | Stefano Morozzi | 02/2025 |
| 2657 | 2^675044-81087 | 203209 | Stefano Morozzi | 01/2025 |
| 2658 | 2^675042-179811 | 203208 | Stefano Morozzi | 01/2025 |
| 2659 | 2^675036-192939 | 203207 | Stefano Morozzi | 01/2025 |
| 2660 | 2^675037-17853 | 203207 | Stefano Morozzi | 01/2025 |
| 2661 | 2^675036+47101 | 203207 | Stefano Morozzi | 02/2025 |
| 2662 | 2^675038+189589 | 203207 | Stefano Morozzi | 02/2025 |
| 2663 | 2^675034-169727 | 203206 | Stefano Morozzi | 01/2025 |
| 2664 | 2^675035-173055 | 203206 | Stefano Morozzi | 01/2025 |
| 2665 | 2^675035-73551 | 203206 | Stefano Morozzi | 01/2025 |
| 2666 | 2^675033+79109 | 203206 | Stefano Morozzi | 02/2025 |
| 2667 | 2^675034+154057 | 203206 | Stefano Morozzi | 02/2025 |
| 2668 | 2^675030+109245 | 203205 | Stefano Morozzi | 01/2025 |
| 2669 | 2^675030-160047 | 203205 | Stefano Morozzi | 01/2025 |
| 2670 | 2^675027+106733 | 203204 | Stefano Morozzi | 01/2025 |
| 2671 | 2^675026-67377 | 203204 | Stefano Morozzi | 01/2025 |
| 2672 | 2^675021+13335 | 203202 | Stefano Morozzi | 01/2025 |
| 2673 | 2^675020-180497 | 203202 | Stefano Morozzi | 01/2025 |
| 2674 | 2^675016+174777 | 203201 | Stefano Morozzi | 01/2025 |
| 2675 | 2^675017+128379 | 203201 | Stefano Morozzi | 01/2025 |
| 2676 | 2^675017+171249 | 203201 | Stefano Morozzi | 01/2025 |
| 2677 | 2^675018+86517 | 203201 | Stefano Morozzi | 01/2025 |
| 2678 | 2^675019+125891 | 203201 | Stefano Morozzi | 01/2025 |
| 2679 | 2^675019+163251 | 203201 | Stefano Morozzi | 01/2025 |
| 2680 | 2^675016-170847 | 203201 | Stefano Morozzi | 01/2025 |
| 2681 | 2^675019-44755 | 203201 | Stefano Morozzi | 01/2025 |
| 2682 | 2^675015+120225 | 203200 | Stefano Morozzi | 01/2025 |
| 2683 | 2^675013-69831 | 203200 | Stefano Morozzi | 01/2025 |
| 2684 | 2^675014-3897 | 203200 | Stefano Morozzi | 01/2025 |
| 2685 | 2^675006+75357 | 203198 | Stefano Morozzi | 01/2025 |
| 2686 | 2^675008+112231 | 203198 | Stefano Morozzi | 01/2025 |
| 2687 | 2^675007-123309 | 203198 | Stefano Morozzi | 01/2025 |
| 2688 | 2^675003+52529 | 203197 | Stefano Morozzi | 01/2025 |
| 2689 | 2^675002+50595 | 203196 | Stefano Morozzi | 01/2025 |
| 2690 | 2^674627-25161 | 203083 | Enzo Doria | 09/2013 |
| 2691 | 2^674603-69337 | 203076 | Enzo Doria | 12/2015 |
| 2692 | (182*10^203048+1)/3 | 203050 | Robert Price | 09/2023 |
| 2693 | 2^674459+74213 | 203033 | Enzo Doria | 04/2016 |
| 2694 | 2^674116-458879 | 202930 | Enzo Doria | 04/2015 |
| 2695 | 2^674076-114755 | 202918 | Enzo Doria | 04/2015 |
| 2696 | 5^289937-4^289937 | 202658 | Jean-Louis Charton | 03/2013 |
| 2697 | 5^289926-289926^5 | 202650 | Henri Lifchitz | 07/2024 |
| 2698 | (2^673184-7)/3 | 202649 | Stefano Morozzi | 08/2022 |
| 2699 | (467617#+14534)/(2^2*13*43) | 202603 | Makoto Morimoto | 06/2019 |
| 2700 | (155^92479-1)/154 | 202558 | Anonymous | 06/2024 |
| 2701 | 2^672773+219407 | 202525 | Enzo Doria | 03/2024 |
| 2702 | 1374^64531-64531^1374 | 202498 | Henri Lifchitz | 10/2024 |
| 2703 | 2^672556-1835519 | 202460 | Enzo Doria | 04/2015 |
| 2704 | (7*10^202267+179)/3 | 202268 | Robert Price | 02/2023 |
| 2705 | 2^671446-351401 | 202126 | Enzo Doria | 07/2015 |
| 2706 | 2^671373+77747 | 202104 | Enzo Doria | 05/2016 |
| 2707 | (2*10^202059+7)/9 | 202059 | Rytis Slatkevicius | 01/2023 |
| 2708 | 98*10^202021-9 | 202023 | Robert Price | 05/2023 |
| 2709 | 2^670726-114845 | 201909 | Enzo Doria | 05/2015 |
| 2710 | 2^670539-25045 | 201853 | Enzo Doria | 09/2013 |
| 2711 | 10^201801-93 | 201801 | Robert Price | 02/2023 |
| 2712 | 43284^43519-43519^43284 | 201769 | Norbert Schneider | 08/2018 |
| 2713 | 2^670213+282317 | 201755 | Enzo Doria | 09/2016 |
| 2714 | 2^670133+89 | 201731 | Stefano Morozzi | 05/2021 |
| 2715 | 2^669854-113501 | 201647 | Enzo Doria | 08/2014 |
| 2716 | 2^669718+81619 | 201606 | Enzo Doria | 08/2016 |
| 2717 | (299*10^201547-17)/3 | 201549 | Robert Price | 02/2023 |
| 2718 | (145*10^201504-1)/9 | 201506 | Serge Batalov | 12/2014 |
| 2719 | 2^668938-1839821 | 201371 | Enzo Doria | 06/2015 |
| 2720 | (198^87623-1)/197 | 201239 | Anonymous | 06/2024 |
| 2721 | 2^668492+1879303 | 201237 | Enzo Doria | 08/2016 |
| 2722 | 7*10^201140-87 | 201141 | Robert Price | 03/2023 |
| 2723 | 6^258413-5^258413 | 201085 | Jean-Louis Charton | 03/2013 |
| 2724 | 10194^50161-50161^10194 | 201063 | Norbert Schneider | 09/2020 |
| 2725 | 2^667894+1875589 | 201057 | Enzo Doria | 06/2016 |
| 2726 | 2^667569-1836559 | 200959 | Enzo Doria | 05/2015 |
| 2727 | (172*10^200746-1)/9 | 200748 | Serge Batalov | 12/2014 |
| 2728 | (166^90407-1)/165 | 200712 | Anonymous | 06/2024 |
| 2729 | 2^666430+782569 | 200616 | Enzo Doria | 10/2016 |
| 2730 | Phi(81682,-81682) | 200612 | Henri Lifchitz | 12/2025 |
| 2731 | (13*10^200610-43)/3 | 200611 | Robert Price | 08/2023 |
| 2732 | Phi(221863,-9) | 200552 | Henri Lifchitz | 12/2025 |
| 2733 | (8*10^200408-11)/3 | 200409 | Robert Price | 07/2023 |
| 2734 | p(38635)#-p(38635+1) | 200356 | Henri Lifchitz | 11/2024 |
| 2735 | (19*10^200260+101)/3 | 200261 | Robert Price | 06/2023 |
| 2736 | 43183^43183+4^4 | 200167 | Serge Batalov | 04/2024 |
| 2737 | (86^103471+1)/87 | 200163 | Paul Bourdelais | 05/2018 |
| 2738 | (10^(2*100072+1)+36*10^100072-1)/9 | 200145 | Robert Price | 09/2023 |
| 2739 | 2^664778+34789 | 200119 | Enzo Doria | 07/2024 |
| 2740 | Phi(23488,19!) | 200101 | Henri Lifchitz | 12/2025 |
| 2741 | 103*(10^100000+20110)^2-4707*(10^100000+20110)+50383 | 200003 | Robert Price | 05/2017 |
| 2742 | 103*(10^100000+33798)^2-4707*(10^100000+33798)+50383 | 200003 | Robert Price | 01/2018 |
| 2743 | numbpart(32235776596) | 200002 | Serge Batalov | 04/2017 |
| 2744 | (10^200001+149)/3 | 200001 | Serge Batalov | 12/2014 |
| 2745 | 10^200000+571791 | 200001 | Patrick De Geest | 08/2019 |
| 2746 | (3^419180-621444)/3 | 200000 | Stefano Morozzi | 06/2019 |
| 2747 | (3^419180-1941384)/3 | 200000 | Stefano Morozzi | 08/2019 |
| 2748 | 10^200000-45557 | 200000 | Patrick De Geest | 08/2019 |
| 2750 | (10^200000-1)/9-10^58838 | 200000 | Akihiko Yoshida | 04/2020 |
| 2749 | 2593604092947240127723272^8192+2593604092947240127722755^8192 | 200000 | Youcef Lemsafer | 01/2023 |
