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 ?
2251	2^664778+34789	200119	Enzo Doria	07/2024
2252	103(10^100000+20110)^2-4707(10^100000+20110)+50383	200003	Robert Price	05/2017
2253	103(10^100000+33798)^2-4707(10^100000+33798)+50383	200003	Robert Price	01/2018
2254	numbpart(32235776596)	200002	Serge Batalov	04/2017
2255	(10^200001+149)/3	200001	Serge Batalov	12/2014
2256	10^200000+571791	200001	Patrick De Geest	08/2019
2257	(3^419180-621444)/3	200000	Stefano Morozzi	06/2019
2258	(3^419180-1941384)/3	200000	Stefano Morozzi	08/2019
2259	10^200000-45557	200000	Patrick De Geest	08/2019
2261	(10^200000-1)/9-10^58838	200000	Akihiko Yoshida	04/2020
2260	2593604092947240127723272^8192+2593604092947240127722755^8192	200000	Youcef Lemsafer	01/2023
2262	(2593604092947240127723019^8192+2593604092947240127723011^8192)/2	199999	Youcef Lemsafer	01/2023
2263	(2593604092947240127723087^8192+2593604092947240127722984^8192)/147457	199994	Youcef Lemsafer	01/2023
2264	(2593604092947240127723229^8192+2593604092947240127723171^8192)/15032745986	199989	Youcef Lemsafer	01/2023
2265	(2593604092947240127723215^8192+2593604092947240127722938^8192)/12728329863169	199986	Youcef Lemsafer	01/2023
2266	92*10^199980-9	199982	Robert Price	12/2021
2267	(2593604092947240127723216^8192+2593604092947240127723163^8192)/20172788859482903707649	199977	Youcef Lemsafer	01/2023
2268	(85*10^199951-139)/9	199952	Robert Price	08/2021
2269	(10^199926+7)/29/373/2339	199919	Alfred Reich	08/2021
2270	2^663838+25819	199836	Enzo Doria	11/2023
2271	23*10^199833-9	199835	Robert Price	10/2021
2272	fibonacci(956176)-4	199829	Jon Grantham	08/2023
2273	(299*10^199801-17)/3	199803	Robert Price	04/2020
2274	6*10^199788+77	199789	Robert Price	06/2020
2275	(2^663604+1)/270750449	199757	Anonymous	10/2024
2276	(23*10^199615+37)/3	199616	Robert Price	02/2022
2277	(17*10^199607-167)/3	199608	Robert Price	05/2022
2278	2^663020-933075	199589	Paul Bourdelais	06/2021
2279	2^663007+29963	199585	Enzo Doria	03/2024
2280	3*2^662703-5	199494	Jon Grantham	07/2023
2281	(14*10^199447+73)/3	199448	Robert Price	12/2018
2282	(2^662424-15)/7	199409	Stefano Morozzi	08/2022
2283	2^662194+22189	199341	Enzo Doria	09/2023
2284	2^662103-29287	199313	Enzo Doria	08/2015
2285	(2*10^199283+457)/9	199283	Robert Price	01/2018
2286	(10^199248-19)/9	199248	Robert Price	01/2018
2287	(83*10^199213+529)/9	199214	Robert Price	12/2021
2288	(194*10^199146-17)/3	199148	Robert Price	09/2020
2289	(151*10^199003-1)/3	199005	Robert Price	03/2020
2290	9*10^198946-73	198947	Robert Price	01/2021
2291	45*10^198931-7	198933	Robert Price	07/2020
2292	2^660482-2891	198825	Yves Minet	05/2016
2293	2^659594+37729	198558	Enzo Doria	10/2024
2294	2^659589-21	198557	Stefano Morozzi	07/2022
2295	2^659583+1879223	198555	Enzo Doria	08/2016
2296	(53*10^198529+1)/9	198530	Serge Batalov	07/2010
2297	(49*10^198403+311)/9	198404	Robert Price	06/2019
2298	96*10^198376-7	198378	Robert Price	03/2021
2299	(10^198375+7)/59/1201/87589	198366	Alfred Reich	08/2021
2300	2^658828-29819	198327	Enzo Doria	08/2015
2301	2^658776-2791229	198312	Enzo Doria	01/2016
2302	(35*10^198294-377)/9	198295	Robert Price	07/2018
2303	(4*10^198268+137)/3	198269	Robert Price	03/2018
2304	2^658544-1854029	198242	Enzo Doria	09/2015
2305	(62*10^198229-233)/9	198230	Robert Price	02/2022
2306	(26*10^198200-41)/3	198201	Robert Price	02/2022
2307	(157^90239-1)/156	198154	Alexander Zhirkov	06/2016
2308	2^657815+26213	198023	Enzo Doria	12/2023
2309	2*10^197959-37	197960	Robert Price	11/2021
2310	(29*10^197941-41)/3	197942	Tyler Busby	03/2024
2311	(232*10^197897+17)/3	197899	Robert Price	04/2021
2312	(4*10^197778+173)/3	197779	Robert Price	02/2018
2313	2^656964+6561	197766	Henri Lifchitz	01/2025
2314	2^656763+211373	197706	Enzo Doria	08/2023
2315	78*10^197702-7	197704	Robert Price	10/2020
2316	(17*10^197640-23)/3	197641	Robert Price	03/2021
2317	(29*10^197629-77)/3	197630	Robert Price	02/2020
2318	2^656462+1874419	197615	Enzo Doria	06/2016
2319	(89^101363+1)/90	197595	Paul Bourdelais	11/2017
2320	2^656172+229051	197528	Enzo Doria	11/2024
2321	2^655893-344563	197444	Enzo Doria	07/2015
2322	2^655875+71333	197439	Enzo Doria	04/2016
2323	2^655845-9	197430	Robert Price	01/2017
2324	(299*10^197426+1)/3	197428	Robert Price	04/2020
2325	2^655682-1849121	197380	Enzo Doria	08/2015
2326	4*10^197268-89	197269	Robert Price	11/2018
2327	(11*10^197198-89)/3	197199	Robert Price	05/2021
2328	2^655045-49603	197189	Enzo Doria	10/2015
2329	2^655000-2784089	197175	Enzo Doria	10/2015
2330	(18^157051-1)/17	197141	Paul Bourdelais	03/2010
2331	(4*10^197061+41)/9	197061	Serge Batalov	11/2022
2332	(154*10^197005+17)/9	197007	Robert Price	06/2022
2333	2^654400-39719	196995	Enzo Doria	09/2015
2334	(5^281807-2^281807)/3	196975	Jon Grantham	08/2023
2335	(14*10^196965-221)/9	196966	Robert Price	04/2018
2336	2^654216-459995	196939	Enzo Doria	06/2015
2337	(17*10^196921+31)/3	196922	Robert Price	01/2019
2338	(14*10^196885-89)/3	196886	Robert Price	05/2020
2339	3*10^196881-59	196882	Robert Price	09/2018
2340	2^653851+82295	196829	Enzo Doria	09/2016
2341	(38*10^196792+691)/9	196793	Robert Price	10/2018
2342	(65*10^196768+493)/9	196769	Robert Price	08/2021
2344	2^653636-29429	196765	Enzo Doria	08/2015
2343	2^653638-11	196765	Stefano Morozzi	07/2022
2345	2^653601-69673	196754	Enzo Doria	02/2016
2346	(44*10^196684+1)/9	196685	Serge Batalov	07/2010
2347	2^652786-1852571	196509	Enzo Doria	08/2015
2348	2^652752-1325	196498	Yves Minet	07/2015
2349	2^652470-1859141	196414	Enzo Doria	10/2015
2350	2^652346+29329	196376	Enzo Doria	02/2024
2351	2^652307+1877483	196364	Enzo Doria	08/2016
2352	2^652293-115273	196360	Enzo Doria	06/2015
2353	(47*10^196281+403)/9	196282	Robert Price	03/2019
2354	2^652025+218027	196280	Enzo Doria	01/2024
2355	2^652004+23961	196273	Enzo Doria	10/2023
2356	(7*10^196125-31)/3	196126	Robert Price	12/2021
2357	33^129128+129128^33	196083	Norbert Schneider	06/2022
2358	6*10^196070+73	196071	Robert Price	04/2019
2359	2^651218-1868201	196037	Enzo Doria	04/2016
2360	2^651047-49687	195985	Enzo Doria	10/2015
2361	10^195968-700001	195968	Robert Price	08/2021
2362	fibonacci(937485)+3	195923	Jon Grantham	08/2023
2363	(29*10^195875-197)/3	195876	Robert Price	08/2021
2364	(25*10^195808-97)/9	195809	Robert Price	01/2022
2365	2^650285-2785333	195756	Enzo Doria	10/2015
2366	(10^195732+7)/18089/49605893	195721	Alfred Reich	08/2021
2367	(29*10^195648-41)/3	195649	Tyler Busby	03/2024
2368	(69^106397-1)/68	195647	Paul Bourdelais	10/2017
2369	2^649811+1877573	195613	Enzo Doria	08/2016
2370	2^649662-170531	195568	Hans Havermann	10/2018
2371	2^649586+182839	195545	Enzo Doria	11/2016
2372	2^649537-1867363	195531	Enzo Doria	04/2016
2373	2^649536-1861499	195530	Enzo Doria	12/2015
2374	2^649493+25907	195517	Enzo Doria	11/2023
2375	(103*10^195478-1)/3	195480	Serge Batalov	12/2014
2376	2^649102-59351	195400	Enzo Doria	10/2015
2377	(2*10^195399+529)/9	195399	Robert Price	01/2018
2378	(202*10^195383-13)/9	195385	Robert Price	01/2020
2379	2^648988+1178971	195365	Enzo Doria	06/2016
2380	2^648975-114319	195361	Enzo Doria	02/2015
2381	(11*10^195350-137)/9	195351	Robert Price	01/2018
2382	2^648619-24835	195254	Enzo Doria	09/2013
2383	5*10^195250-21	195251	Robert Price	12/2021
2384	(14*10^195234-83)/3	195235	Robert Price	12/2018
2385	5*10^195221+81	195222	Robert Price	03/2019
2386	10^195143-5001	195143	Robert Price	12/2021
2387	2^648190-24737	195125	Enzo Doria	09/2013
2388	(57^111119+1)/58	195110	Paul Bourdelais	10/2017
2389	(29*10^195098-197)/3	195099	Robert Price	08/2021
2390	10^195060+89701	195061	Patrick De Geest	02/2021
2392	10^195060-40000000001	195060	Robert Price	09/2020
2391	10^195060-110337	195060	Patrick De Geest	02/2021
2393	56*10^195032-3	195034	Robert Price	03/2020
2394	11^187185-90	194934	Enzo Doria	09/2012
2395	2^647545-25	194931	Boyan Hu	12/2024
2396	2^647468+220141	194908	Enzo Doria	03/2024
2397	(86*10^194818-437)/9	194819	Robert Price	03/2021
2398	7^230492-230492^7	194789	Henri Lifchitz	07/2024
2399	2^647068+77281	194787	Enzo Doria	05/2016
2400	2*10^194716-93	194717	Robert Price	12/2021
2401	15^165559-14^165559	194713	Jean-Louis Charton	03/2011
2402	F(931517)	194676	Henri Lifchitz	09/2008
2403	4*10^194668+49	194669	Robert Price	01/2019
2404	2^646589+1179407	194643	Enzo Doria	06/2016
2405	2^646289-114621	194553	Enzo Doria	05/2015
2406	2^646236-39659	194537	Enzo Doria	09/2015
2407	(16*10^194536+53)/3	194537	Robert Price	03/2019
2408	2^646161-59833	194514	Enzo Doria	11/2015
2409	(17*10^194502+31)/3	194503	Robert Price	01/2019
2410	(19*10^194428+287)/9	194429	Robert Price	10/2021
2411	2*10^194413+3	194414	Robert Price	07/2015
2412	2^645360-1848599	194273	Enzo Doria	08/2015
2413	22470^44641+44641^22470	194260	Norbert Schneider	08/2023
2414	(112*10^194150-1)/3	194152	Serge Batalov	12/2014
2415	Phi(293127,10)	194041	Makoto Kamada	12/2023
2416	2*10^193981-43	193982	Robert Price	04/2018
2417	2^644382+75169	193979	Enzo Doria	04/2016
2418	2^644304-1861409	193955	Enzo Doria	11/2015
2419	(29*10^193950-23)/3	193951	Robert Price	03/2022
2420	5*10^193907-9	193908	Robert Price	05/2015
2421	2^644043+1876703	193877	Enzo Doria	07/2016
2422	2*10^193841-63	193842	Robert Price	01/2022
2423	2^643735+1879733	193784	Enzo Doria	09/2016
2424	(5^277183+1)/6	193742	Paul Bourdelais	07/2010
2425	9*10^193712+71	193713	Robert Price	08/2020
2426	2^643216-286565	193628	Enzo Doria	07/2015
2427	2^643204+215011	193624	Enzo Doria	11/2023
2428	10^193566+1126339	193567	Patrick De Geest	09/2022
2430	10^193566-10000000001	193566	Robert Price	04/2021
2429	10^193566-454041	193566	Patrick De Geest	08/2021
2432	2^642888-24965	193529	Enzo Doria	09/2013
2431	2^642889+25367	193529	Enzo Doria	11/2023
2433	2^642448-114825	193397	Enzo Doria	05/2015
2434	2^642437-1856623	193393	Enzo Doria	10/2015
2435	2^642039-59797	193273	Enzo Doria	11/2015
2436	2^641987+39	193258	Jon Grantham	08/2023
2437	10^193230+513861	193231	Patrick De Geest	07/2018
2438	10^193230-8001	193230	Robert Price	03/2018
2439	(62*10^193225-233)/9	193226	Robert Price	02/2022
2440	2^641692-286349	193169	Enzo Doria	07/2015
2441	2^641690-24737	193168	Enzo Doria	09/2013
2442	22268^44421+44421^22268	193129	Norbert Schneider	06/2023
2443	2^641514+1876549	193115	Enzo Doria	07/2016
2444	2^640888-2785619	192927	Enzo Doria	10/2015
2445	2^640874-2783741	192923	Enzo Doria	09/2015
2446	10^192922+192207	192923	Patrick De Geest	08/2021
2447	10^192922-7001	192922	Robert Price	04/2021
2448	2^640854+25	192917	Stefano Morozzi	05/2021
2449	34*10^192868-9	192870	Robert Price	06/2020
2450	(46*10^192841+683)/9	192842	Robert Price	03/2019
2451	2^640181+467	192714	Lelio R Paula	08/2013
2452	2^640072+27541	192681	Enzo Doria	01/2024
2453	2^639536-1850249	192520	Enzo Doria	08/2015
2454	40714<>40712<>...<>1086421357911<>...<>40711<>40713	192464	Hans Havermann	12/2019
2455	5*10^192422-43	192423	Robert Price	01/2019
2456	2^639110-2792441	192392	Enzo Doria	02/2016
2457	(241^80761-1)/240	192372	Anonymous	04/2024
2458	2^638955-29827	192345	Enzo Doria	08/2015
2459	15^163539+14	192337	Alfred Reich	10/2023
2460	2^638713-2784223	192272	Enzo Doria	10/2015
2461	(10^192216+7)/149	192214	Alfred Reich	07/2021
2462	2^638490-113507	192205	Enzo Doria	08/2014
2463	2^638189-39943	192115	Enzo Doria	09/2015
2464	2^638110+1877119	192091	Enzo Doria	07/2016
2465	MillsLike(2,1,4,12,4,22,12,114,4,138,142,2956,6388,5248,17532,96930,83782,1464,897448,300832)+82440	192083	Sergey Batalov	05/2024
2466	MillsLike(2,1,4,12,4,22,12,114,4,138,142,2956,6388,5248,17532,96930,83782,1464,897448,300832)	192083	Sergey Batalov	05/2024
2467	2^638066-2785211	192078	Enzo Doria	10/2015
2468	(35*10^191973-341)/9	191974	Robert Price	08/2021
2469	(112*10^191900+17)/3	191902	Robert Price	03/2020
2470	2^637475-115309	191900	Enzo Doria	07/2015
2471	(68*10^191754-113)/9	191755	Robert Price	03/2021
2472	2^636930-11	191736	Stefano Morozzi	07/2022
2473	(47*10^191732+259)/9	191733	Robert Price	03/2022
2474	2^636661+1876577	191655	Enzo Doria	07/2016
2475	(9^200807-2^200807)/7	191618	Jon Grantham	07/2023
2476	(34^125101-1)/33	191589	Paul Bourdelais	11/2017
2477	fibonacci(916540)-2	191546	Jon Grantham	08/2023
2478	2^636177-1855123	191509	Enzo Doria	09/2015
2479	2^636158-113627	191503	Enzo Doria	08/2014
2480	(37*25^136966+63)/4	191472	Curtis Bright	05/2015
2481	2^636035+79823	191466	Enzo Doria	06/2016
2482	2^636011-1860847	191459	Enzo Doria	11/2015
2483	2^635926-1860611	191433	Enzo Doria	11/2015
2484	3*2^635755+5	191382	Jon Grantham	07/2023
2485	3*10^191152-7	191153	Robert Price	08/2015
2486	2^634883-1865677	191119	Enzo Doria	02/2016
2487	2^634801+1871957	191095	Enzo Doria	05/2016
2488	(77*10^191080+157)/9	191081	Robert Price	05/2022
2489	(35*10^191073+1)/9	191074	Serge Batalov	07/2010
2490	9*10^191018-41	191019	Robert Price	08/2020
2491	2^634470-59861	190995	Enzo Doria	11/2015
2492	2^634368-29519	190964	Enzo Doria	08/2015
2493	(19*10^190935+11)/3	190936	Robert Price	07/2023
2494	2^634188-350609	190910	Enzo Doria	06/2015
2495	(65*10^190899+493)/9	190900	Robert Price	08/2021
2496	(62*10^190795-413)/9	190796	Robert Price	09/2021
2497	(26*10^190789-131)/3	190790	Robert Price	10/2019
2498	(13*10^190732-61)/3	190733	Robert Price	11/2018
2499	3*2^633524+5	190711	Jon Grantham	07/2023
2500	(7*10^190683+143)/3	190684	Robert Price	03/2018

Find by discoverer :

PRP Records

Probable Primes Top 10000

(301157 PRPs in the top)