Henri & Renaud Lifchitz's PRP Top records

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


1-250	251-500	501-750	751-1000	1001-1250	1251-1500	1501-1750	1751-2000
2001-2250	2251-2500	2501-2750	2751-3000	3001-3250	3251-3500	3501-3750	3751-4000
4001-4250	4251-4500	4501-4750	4751-5000	5001-5250	5251-5500	5501-5750	5751-6000
6001-6250	6251-6500	6501-6750	6751-7000	7001-7250	7251-7500	7501-7750	7751-8000
8001-8250	8251-8500	8501-8750	8751-9000	9001-9250	9251-9500	9501-9750	9751-10000

Rank	Probable prime	Digits (> 50000)	Who ?	When ?
7501	6^139022-59	108181	Lelio R Paula	02/2017
7502	(19*10^108176-43)/3	108177	Robert Price	05/2019
7503	2^359352-179	108176	Lelio R Paula	12/2011
7504	2^359338-1858781	108172	Enzo Doria	04/2016
7505	12^100230-97	108167	Lelio R Paula	03/2017
7506	27028^10043+10043^27028	108163	Hans Havermann	11/2020
7507	(25*2^359297-1)/137	108159	Lelio R Paula	03/2014
7508	(2^359262-509203)/9	108148	Lelio R Paula	12/2013
7509	26583^11702+11702^26583	108147	Hans Havermann	11/2020
7510	(3^226648-8)/352715633	108131	Lelio R Paula	12/2013
7511	6^138956-59	108129	Lelio R Paula	02/2017
7512	2^359184+30285	108126	Lelio R Paula	04/2017
7513	13^97059+10	108119	Lelio R Paula	03/2017
7514	2^359137-81	108112	Lelio R Paula	12/2011
7516	(15185*2^359105-1)/567	108103	Lelio R Paula	05/2015
7515	2^359110-11655	108103	Lelio R Paula	04/2017
7517	2^359069-933075	108091	Paul Bourdelais	06/2021
7518	26227^13222+13222^26227	108090	Hans Havermann	10/2020
7519	8*6^138875+5	108067	Lelio R Paula	11/2014
7520	2^358987-216919	108066	Enzo Doria	05/2014
7521	(2^358977+2714)/2	108063	Stefano Morozzi	09/2020
7522	39^67918-67918^39	108062	Norbert Schneider	02/2017
7523	24^78283-1*78283^24	108048	Dylan Delgado	12/2019
7524	25282^18767+18767^25282	108040	Hans Havermann	11/2020
7525	(918^36457-1)/917	108014	Tom Wu	08/2025
7526	2^358785-16933	108006	Enzo Doria	05/2013
7527	(2^358783+5)/33383	108000	Lelio R Paula	12/2013
7528	6^138770-77	107985	Lelio R Paula	02/2017
7529	(2^358727-1017)/94178479	107980	Lelio R Paula	12/2013
7530	10^107976+19	107977	Lelio R Paula	02/2017
7531	10^107976-202103	107976	Patrick De Geest	03/2017
7532	2^358684+75781	107975	Enzo Doria	04/2016
7533	24928^21411+21411^24928	107955	Hans Havermann	10/2020
7534	99^54094+2	107952	Lelio R Paula	06/2013
7535	(2^358583-9)/391	107942	Lelio R Paula	12/2013
7536	(2^358562+838)/2	107938	Stefano Morozzi	02/2021
7537	2^358538+55	107931	Lelio R Paula	12/2011
7538	2^358517-109009	107925	Enzo Doria	03/2014
7539	26395^12258+12258^26395	107914	Hans Havermann	10/2020
7540	3^226159+104	107906	Lelio R Paula	03/2017
7541	7*10^107870+39	107871	Robert Price	01/2023
7542	2^358310-11655	107863	Lelio R Paula	03/2017
7543	(68*10^107852-329)/9	107853	Robert Price	03/2021
7544	2^358275-112987	107852	Enzo Doria	07/2014
7545	3^226038+4	107848	Tyler NeSmith	01/2021
7546	2^358233-20005	107839	Enzo Doria	06/2013
7547	2^358194+175	107828	Lelio R Paula	12/2011
7548	107^53125-106	107812	Norbert Schneider	12/2016
7549	(25*10^107804+161)/3	107805	Robert Price	09/2019
7550	3^225922-2	107793	Lelio R Paula	10/2013
7551	12^99874-95	107783	Lelio R Paula	03/2017
7552	(2^358042+3042)/2	107782	Stefano Morozzi	09/2020
7553	2^358030-171	107778	Lelio R Paula	12/2011
7554	11^103488-4170	107772	Enzo Doria	12/2012
7555	2^357930-4547	107748	Yves Minet	03/2019
7556	2^357911-20089	107742	Enzo Doria	06/2013
7557	2^357885+12857	107735	Yves Minet	07/2010
7558	(248587#+9289)/(71327111512899)	107733	Makoto Morimoto	06/2019
7559	7^127473+40	107728	Lelio R Paula	03/2017
7560	5*2^357850+9	107725	Lelio R Paula	09/2014
7561	2^357786-291191	107705	Enzo Doria	06/2015
7562	28907^5320+5320^28907	107705	Hans Havermann	10/2020
7563	18^85798-23	107700	Lelio R Paula	04/2017
7564	3*10^107697+61	107698	Robert Price	09/2020
7565	(14*10^107694-83)/3	107695	Robert Price	12/2018
7566	2^357688-1854269	107675	Enzo Doria	09/2015
7567	2^357671-112225	107670	Enzo Doria	06/2014
7568	34323^1370+1370^34323	107662	Hans Havermann	11/2020
7569	2^357618-21005	107654	Enzo Doria	06/2013
7570	2^357615-17505	107653	Enzo Doria	05/2013
7571	26350^12171+12171^26350	107649	Hans Havermann	11/2020
7572	(30^72871-1)/29	107638	Robert Price	12/2011
7573	25021^20026+20026^25021	107631	Hans Havermann	11/2020
7574	2^357521+1870217	107625	Enzo Doria	05/2016
7575	2^357477-1203	107612	Lelio R Paula	03/2017
7576	26008^13693+13693^26008	107583	Hans Havermann	10/2020
7577	25432^16991+16991^25432	107583	Hans Havermann	10/2020
7578	(2^357371+3726)/2	107580	Stefano Morozzi	09/2020
7579	5^153894-18	107568	Lelio R Paula	02/2017
7580	2^357324-69059	107566	Enzo Doria	11/2015
7581	467^40296+40296^467	107563	Norbert Schneider	03/2019
7582	29446^4495+4495^29446	107559	Hans Havermann	10/2020
7583	(8*10^107556-149)/3	107557	Robert Price	12/2021
7584	2^357283-869688105	107553	Lelio R Paula	01/2017
7585	2^357280-16805	107552	Enzo Doria	05/2013
7586	10^107547+481719	107548	Patrick De Geest	03/2017
7587	10^107547-47	107547	Lelio R Paula	02/2017
7588	(23*10^107540+37)/3	107541	Robert Price	02/2022
7589	17^87396-32	107537	Lelio R Paula	04/2017
7590	(746*10^107505+1)/9	107507	Robert Price	03/2020
7591	(2^357125+1730)/2	107506	Stefano Morozzi	09/2020
7592	2^357081+107	107493	Lelio R Paula	12/2011
7593	2^357058-3911	107486	Yves Minet	04/2017
7594	3^225274+64	107484	Lelio R Paula	03/2017
7595	5*10^107482-57	107483	Robert Price	03/2021
7596	18^85619-95	107476	Lelio R Paula	04/2017
7597	(2^357013+2526)/2	107472	Stefano Morozzi	09/2020
7598	3^225248-130	107471	Lelio R Paula	03/2017
7599	(5*2^356961+1)/143	107455	Lelio R Paula	03/2014
7600	27029^9448+9448^27029	107450	Hans Havermann	11/2020
7601	2^356935-18085	107449	Enzo Doria	05/2013
7602	55396^87+87^55396	107442	Hans Havermann	10/2020
7603	(14*10^107439-137)/3	107440	Robert Price	04/2021
7604	164^48505-48505^164	107432	Norman Luhn	09/2024
7605	10^107409+37	107410	Lelio R Paula	02/2017
7606	10^107409-329633	107409	Patrick De Geest	03/2017
7607	(2^356799+3134)/2	107407	Stefano Morozzi	09/2020
7608	2^356787-109027	107404	Enzo Doria	04/2014
7609	(2^356767+78557)/5	107397	Lelio R Paula	12/2013
7610	3*10^107389+77	107390	Robert Price	09/2018
7611	(11*10^107385+61)/9	107386	Tyler Busby	01/2023
7612	5^153622-42	107378	Lelio R Paula	02/2017
7613	2^356699-97305	107378	Lelio R Paula	03/2017
7614	13129^26072-26072^13129	107371	Norbert Schneider	09/2022
7615	2^356654+85	107364	Lelio R Paula	11/2011
7616	2^356641-19921	107360	Enzo Doria	06/2013
7617	5*10^107355+11	107356	Robert Price	08/2019
7618	2^356623-465	107355	Lelio R Paula	03/2017
7619	19^83945-92	107345	Lelio R Paula	02/2017
7620	25491^16246+16246^25491	107337	Hans Havermann	11/2020
7621	10^107334+28149	107335	Patrick De Geest	03/2017
7622	10^107334-83	107334	Lelio R Paula	02/2017
7623	2^356518+885	107323	Lelio R Paula	03/2017
7624	(59*10^107322+391)/9	107323	Robert Price	03/2021
7625	(3*2^356506-1)/467	107317	Lelio R Paula	03/2014
7626	(2^356468+1162)/2	107308	Stefano Morozzi	09/2020
7627	2^356442-114713	107300	Enzo Doria	04/2015
7628	2^356425+72257	107295	Enzo Doria	04/2016
7629	2^356351-112237	107273	Enzo Doria	06/2014
7631	(6^137845-11)/5	107264	Paul Bourdelais	11/2011
7630	2^356322+74539	107264	Enzo Doria	04/2016
7632	2^356274+1874479	107250	Enzo Doria	06/2016
7633	24606^22819+22819^24606	107241	Hans Havermann	10/2020
7634	(2^356243+3686)/2	107240	Stefano Morozzi	09/2020
7635	20^82422-93	107234	Lelio R Paula	02/2017
7636	2^356157-20365	107214	Enzo Doria	06/2013
7637	8*10^107209+99	107210	Robert Price	03/2021
7638	2^356129-18949	107206	Enzo Doria	05/2013
7639	(15^91163-1)/13873078234414574	107200	Paul Vanderveen	06/2025
7640	2^356100-109587	107197	Enzo Doria	04/2014
7641	2*10^107173-37	107174	Robert Price	11/2021
7642	(2^355978+3262)/2	107160	Stefano Morozzi	02/2021
7643	(31*2^355970+1)/5	107159	Lelio R Paula	03/2014
7644	2^355968-64875	107158	Lelio R Paula	01/2017
7645	2^355952+1870321	107153	Enzo Doria	05/2016
7646	27069^9088+9088^27069	107152	Hans Havermann	11/2020
7647	2^355915-117	107142	Lelio R Paula	11/2011
7648	(16*10^107140+77)/3	107141	Robert Price	03/2019
7649	24628^22369+22369^24628	107124	Hans Havermann	11/2020
7650	(19*2^355838-1)/15	107119	Lelio R Paula	03/2014
7651	3^224495-8	107112	Lelio R Paula	12/2013
7652	3*10^107096+23	107097	Robert Price	03/2022
7653	25077^18632+18632^25077	107086	Hans Havermann	10/2020
7654	7^126691-44	107067	Lelio R Paula	03/2017
7655	4^177830-8243	107065	Mike Oakes	02/2011
7656	(509*10^107057+13)/9	107059	Robert Price	05/2022
7657	2^355604+214051	107048	Enzo Doria	10/2023
7658	(2^355562+1702)/2	107035	Stefano Morozzi	09/2020
7659	10^107028+3593037	107029	Paul Bourdelais	10/2021
7660	10^107028-43301	107028	Alfred Reich	08/2024
7661	2^355524-21237	107024	Enzo Doria	06/2013
7663	(10223*2^355515+1)/4855	107022	Lelio R Paula	07/2014
7662	24843^20320+20320^24843	107022	Hans Havermann	10/2020
7664	2^355494-19901	107015	Enzo Doria	06/2013
7665	2^355454-869688105	107003	Lelio R Paula	01/2017
7666	4*10^106997+13	106998	Robert Price	02/2021
7667	(8*10^106985-629)/9	106985	Robert Price	01/2022
7668	2^355366+54615	106976	Lelio R Paula	01/2017
7669	(31*2^355346-1)/1563	106969	Lelio R Paula	03/2014
7670	2^355275-19861	106949	Enzo Doria	06/2013
7671	27503^7738+7738^27503	106949	Hans Havermann	11/2020
7672	(85*10^106943+77)/9	106944	Robert Price	07/2022
7673	(9179*2^355234-1)/1915	106937	Lelio R Paula	05/2015
7674	4*10^106914-93	106915	Robert Price	07/2020
7675	(151^49069-1)/90910031243271150	106904	Paul Vanderveen	06/2025
7676	4*10^106892-3	106893	Robert Price	10/2015
7677	(66^58741+1)/67	106881	Paul Bourdelais	08/2017
7678	2^355001+335931	106866	Enzo Doria	08/2024
7679	2^354946-3	106850	M. Frind & P. Underwood	08/2002
7680	(2^354945+3134)/2	106849	Stefano Morozzi	09/2020
7681	(46^64384+1)/(46^128+1)	106843	Martin Hopf	12/2023
7682	2^354873-18693	106828	Enzo Doria	05/2013
7683	(2^354831+3186)/2	106815	Stefano Morozzi	09/2020
7685	2^354828+4257	106814	Lelio R Paula	01/2017
7684	25216^17217+17217^25216	106814	Hans Havermann	10/2020
7686	(2^354799+1218)/2	106805	Stefano Morozzi	09/2020
7687	436^40459+40459^436	106791	Norbert Schneider	03/2019
7688	(21^80761+1)/22	106783	Paul Bourdelais	03/2010
7689	(115*10^106772-7)/9	106774	Robert Price	02/2020
7690	2^354640-354640+1	106758	Robert Price	10/2014
7691	(2^354603+2606)/2	106746	Stefano Morozzi	09/2020
7692	2^354585+95	106741	Lelio R Paula	10/2011
7693	(206*10^106737+1)/9	106739	Robert Price	04/2022
7694	2^354553+189	106732	Lelio R Paula	10/2011
7696	(2^354546+1338)/2	106729	Stefano Morozzi	02/2021
7695	(8*10^106729-71)/9	106729	Serge Batalov	11/2022
7697	2^354514-109031	106720	Enzo Doria	04/2014
7698	2^354509-109465	106718	Enzo Doria	04/2014
7699	fibonacci(510628)+2	106715	Jon Grantham	08/2023
7700	(15*2^354478-1)/26983	106706	Lelio R Paula	03/2014
7701	Phi(217618,10)/899798636917	106693	Makoto Kamada	06/2019
7702	15^90710+28	106684	Lelio R Paula	04/2017
7703	7^126237+34	106683	Lelio R Paula	03/2017
7704	2^354385-115315	106681	Enzo Doria	06/2015
7705	2^354327-19305	106664	Enzo Doria	06/2013
7706	(35*10^106649+1)/9	106650	Serge Batalov	11/2010
7707	10^106636+97	106637	Lelio R Paula	02/2017
7708	10^106636-22923	106636	Patrick De Geest	03/2017
7709	2^354220-57	106631	Lelio R Paula	10/2011
7710	(68*10^106628-329)/9	106629	Robert Price	03/2021
7711	(29*10^106620-77)/3	106621	Robert Price	02/2020
7712	(746*10^106618+1)/9	106620	Robert Price	03/2020
7713	2*10^106613+29	106614	Robert Price	02/2021
7714	2^354157-17041	106612	Enzo Doria	05/2013
7715	12^98778+73	106600	Lelio R Paula	02/2017
7716	33333^1576+1576^33333	106585	Hans Havermann	11/2020
7717	2^354064+1870651	106584	Enzo Doria	05/2016
7718	24568^21779+21779^24568	106577	Hans Havermann	11/2020
7719	2^353992-57	106563	Lelio R Paula	10/2011
7720	9*10^106559+59	106560	Robert Price	01/2020
7721	7*10^106553+27	106554	Robert Price	11/2020
7722	28847^4938+4938^28847	106548	Hans Havermann	10/2020
7723	(20^81901-1)/42030774209	106546	Paul Vanderveen	06/2025
7725	NSW(139160)	106535	Robert Price	12/2018
7724	f(278321)	106535	Robert Price	07/2023
7726	(7*10^106516+113)/3	106517	Robert Price	02/2018
7727	2^353832-1853849	106515	Enzo Doria	09/2015
7728	(7^126037-1)/6	106513	Paul Bourdelais	09/2008
7729	2^353794-18453	106503	Enzo Doria	05/2013
7730	(2^353761+2094)/2	106493	Stefano Morozzi	09/2020
7731	2^353728+7695	106483	Lelio R Paula	01/2017
7732	26476^10509+10509^26476	106475	Hans Havermann	10/2020
7733	2^353672-303	106466	Yves Minet	02/2012
7734	6^136811+101	106460	Lelio R Paula	02/2017
7735	2^353641+1871981	106457	Enzo Doria	05/2016
7736	(8*10^106454-29)/3	106455	Robert Price	07/2018
7737	27845^6654+6654^27845	106454	Hans Havermann	11/2020
7738	10^106449-700001	106449	Robert Price	08/2021
7739	25316^16017+16017^25316	106444	Hans Havermann	11/2020
7740	2^353553+54615	106431	Lelio R Paula	01/2017
7741	2^353544-18897	106428	Enzo Doria	05/2013
7742	28894^4823+4823^28894	106426	Hans Havermann	11/2020
7743	(19*10^106422+29)/3	106423	Robert Price	12/2021
7744	(694*10^106418+53)/9	106420	Robert Price	02/2022
7745	6*10^106412-13	106413	Robert Price	07/2022
7746	25696^13829+13829^25696	106402	Hans Havermann	11/2020
7747	6^136729-133	106396	Lelio R Paula	02/2017
7748	2^353418+1605	106390	Lelio R Paula	01/2017
7749	2^353387+65	106381	Lelio R Paula	10/2011
7750	2^353372+74311	106376	Enzo Doria	04/2016

Find by discoverer :

PRP Records

Probable Primes Top 10000

(301969 PRPs in the top)