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 ?
3001	2^655845-9	197430	Robert Price	01/2017
3002	(299*10^197426+1)/3	197428	Robert Price	04/2020
3003	2^655682-1849121	197380	Enzo Doria	08/2015
3004	4*10^197268-89	197269	Robert Price	11/2018
3005	(11*10^197198-89)/3	197199	Robert Price	05/2021
3006	2^655045-49603	197189	Enzo Doria	10/2015
3007	2^655000-2784089	197175	Enzo Doria	10/2015
3008	(18^157051-1)/17	197141	Paul Bourdelais	03/2010
3009	(4*10^197061+41)/9	197061	Serge Batalov	11/2022
3010	(154*10^197005+17)/9	197007	Robert Price	06/2022
3011	2^654400-39719	196995	Enzo Doria	09/2015
3012	(5^281807-2^281807)/3	196975	Jon Grantham	08/2023
3013	(14*10^196965-221)/9	196966	Robert Price	04/2018
3014	(7^233069-1)/52258731186	196956	Paul Vanderveen	05/2025
3015	2^654216-459995	196939	Enzo Doria	06/2015
3016	(17*10^196921+31)/3	196922	Robert Price	01/2019
3017	(14*10^196885-89)/3	196886	Robert Price	05/2020
3018	3*10^196881-59	196882	Robert Price	09/2018
3019	2^653851+82295	196829	Enzo Doria	09/2016
3020	(38*10^196792+691)/9	196793	Robert Price	10/2018
3021	2^653700+37778931862957161709567	196784	Alfred Reich	05/2026
3022	(65*10^196768+493)/9	196769	Robert Price	08/2021
3024	2^653636-29429	196765	Enzo Doria	08/2015
3023	2^653638-11	196765	Stefano Morozzi	07/2022
3025	2^653601-69673	196754	Enzo Doria	02/2016
3026	(44*10^196684+1)/9	196685	Serge Batalov	07/2010
3027	2^652786-1852571	196509	Enzo Doria	08/2015
3028	2^652752-1325	196498	Yves Minet	07/2015
3029	2^652470-1859141	196414	Enzo Doria	10/2015
3030	2^652346+29329	196376	Enzo Doria	02/2024
3031	2^652307+1877483	196364	Enzo Doria	08/2016
3032	2^652293-115273	196360	Enzo Doria	06/2015
3033	(47*10^196281+403)/9	196282	Robert Price	03/2019
3034	2^652025+218027	196280	Enzo Doria	01/2024
3035	2^652004+23961	196273	Enzo Doria	10/2023
3036	(7*10^196125-31)/3	196126	Robert Price	12/2021
3037	33^129128+129128^33	196083	Norbert Schneider	06/2022
3038	6*10^196070+73	196071	Robert Price	04/2019
3039	2^651218-1868201	196037	Enzo Doria	04/2016
3040	2^651047-49687	195985	Enzo Doria	10/2015
3041	10^195968-700001	195968	Robert Price	08/2021
3042	fibonacci(937485)+3	195923	Jon Grantham	08/2023
3043	(29*10^195875-197)/3	195876	Robert Price	08/2021
3044	(25*10^195808-97)/9	195809	Robert Price	01/2022
3045	2^650285-2785333	195756	Enzo Doria	10/2015
3046	(10^195732+7)/18089/49605893	195721	Alfred Reich	08/2021
3047	(29*10^195648-41)/3	195649	Tyler Busby	03/2024
3048	(69^106397-1)/68	195647	Paul Bourdelais	10/2017
3049	256^81228+255	195617	Alfred Reich	06/2026
3050	2^649811+1877573	195613	Enzo Doria	08/2016
3051	2^649662-170531	195568	Hans Havermann	10/2018
3052	2^649586+182839	195545	Enzo Doria	11/2016
3053	2^649537-1867363	195531	Enzo Doria	04/2016
3054	2^649536-1861499	195530	Enzo Doria	12/2015
3055	2^649493+25907	195517	Enzo Doria	11/2023
3056	(103*10^195478-1)/3	195480	Serge Batalov	12/2014
3057	2^649102-59351	195400	Enzo Doria	10/2015
3058	(2*10^195399+529)/9	195399	Robert Price	01/2018
3059	(202*10^195383-13)/9	195385	Robert Price	01/2020
3060	2^648988+1178971	195365	Enzo Doria	06/2016
3061	2^648975-114319	195361	Enzo Doria	02/2015
3062	(11*10^195350-137)/9	195351	Robert Price	01/2018
3063	2^648619-24835	195254	Enzo Doria	09/2013
3064	5*10^195250-21	195251	Robert Price	12/2021
3065	(14*10^195234-83)/3	195235	Robert Price	12/2018
3066	5*10^195221+81	195222	Robert Price	03/2019
3067	10^195143-5001	195143	Robert Price	12/2021
3068	2^648190-24737	195125	Enzo Doria	09/2013
3069	(57^111119+1)/58	195110	Paul Bourdelais	10/2017
3070	(29*10^195098-197)/3	195099	Robert Price	08/2021
3071	10^195060+89701	195061	Patrick De Geest	02/2021
3073	10^195060-40000000001	195060	Robert Price	09/2020
3072	10^195060-110337	195060	Patrick De Geest	02/2021
3074	56*10^195032-3	195034	Robert Price	03/2020
3075	11^187185-90	194934	Enzo Doria	09/2012
3076	2^647545-25	194931	Boyan Hu	12/2024
3077	2^647468+220141	194908	Enzo Doria	03/2024
3078	(83^101533-1)/91545628589416644493342	194827	Paul Vanderveen	06/2025
3079	(86*10^194818-437)/9	194819	Robert Price	03/2021
3080	7^230492-230492^7	194789	Henri Lifchitz	07/2024
3081	2^647068+77281	194787	Enzo Doria	05/2016
3082	2*10^194716-93	194717	Robert Price	12/2021
3083	15^165559-14^165559	194713	Jean-Louis Charton	03/2011
3084	F(931517)	194676	Henri Lifchitz	09/2008
3085	4*10^194668+49	194669	Robert Price	01/2019
3086	408^74564+407	194662	Alfred Reich	04/2026
3087	2^646589+1179407	194643	Enzo Doria	06/2016
3088	2^646289-114621	194553	Enzo Doria	05/2015
3089	2^646236-39659	194537	Enzo Doria	09/2015
3090	(16*10^194536+53)/3	194537	Robert Price	03/2019
3091	2^646161-59833	194514	Enzo Doria	11/2015
3092	(17*10^194502+31)/3	194503	Robert Price	01/2019
3093	(19*10^194428+287)/9	194429	Robert Price	10/2021
3094	2*10^194413+3	194414	Robert Price	07/2015
3095	2^645360-1848599	194273	Enzo Doria	08/2015
3096	22470^44641+44641^22470	194260	Norbert Schneider	08/2023
3097	(112*10^194150-1)/3	194152	Serge Batalov	12/2014
3098	Phi(293127,10)	194041	Makoto Kamada	12/2023
3099	2*10^193981-43	193982	Robert Price	04/2018
3100	2^644382+75169	193979	Enzo Doria	04/2016
3101	2^644304-1861409	193955	Enzo Doria	11/2015
3102	(29*10^193950-23)/3	193951	Robert Price	03/2022
3103	5*10^193907-9	193908	Robert Price	05/2015
3104	2^644043+1876703	193877	Enzo Doria	07/2016
3105	2*10^193841-63	193842	Robert Price	01/2022
3106	2^643735+1879733	193784	Enzo Doria	09/2016
3108	(5^277183+1)/6	193742	Paul Bourdelais	07/2010
3107	Phi(277183,-5)	193742	Henri Lifchitz	12/2025
3109	9*10^193712+71	193713	Robert Price	08/2020
3110	2^643216-286565	193628	Enzo Doria	07/2015
3111	2^643204+215011	193624	Enzo Doria	11/2023
3112	10^193566+1126339	193567	Patrick De Geest	09/2022
3114	10^193566-10000000001	193566	Robert Price	04/2021
3113	10^193566-454041	193566	Patrick De Geest	08/2021
3116	2^642888-24965	193529	Enzo Doria	09/2013
3115	2^642889+25367	193529	Enzo Doria	11/2023
3117	Phi(50157,p(50157))	193510	Henri Lifchitz	12/2025
3118	2^642448-114825	193397	Enzo Doria	05/2015
3119	2^642437-1856623	193393	Enzo Doria	10/2015
3120	2^642039-59797	193273	Enzo Doria	11/2015
3121	2^641987+39	193258	Jon Grantham	08/2023
3122	10^193230+513861	193231	Patrick De Geest	07/2018
3123	10^193230-8001	193230	Robert Price	03/2018
3124	(62*10^193225-233)/9	193226	Robert Price	02/2022
3125	Phi(86312,13#)	193216	Henri Lifchitz	02/2026
3126	2^641692-286349	193169	Enzo Doria	07/2015
3127	2^641690-24737	193168	Enzo Doria	09/2013
3128	22268^44421+44421^22268	193129	Norbert Schneider	06/2023
3129	2^641514+1876549	193115	Enzo Doria	07/2016
3130	2^640888-2785619	192927	Enzo Doria	10/2015
3131	2^640874-2783741	192923	Enzo Doria	09/2015
3132	10^192922+192207	192923	Patrick De Geest	08/2021
3133	10^192922-7001	192922	Robert Price	04/2021
3134	2^640854+25	192917	Stefano Morozzi	05/2021
3135	34*10^192868-9	192870	Robert Price	06/2020
3136	(46*10^192841+683)/9	192842	Robert Price	03/2019
3137	2^640181+467	192714	Lelio R Paula	08/2013
3138	2^640072+27541	192681	Enzo Doria	01/2024
3139	(10^192700)/(192700^10)	192648	Henri Lifchitz	05/2025
3140	2^639536-1850249	192520	Enzo Doria	08/2015
3141	40714<>40712<>...<>1086421357911<>...<>40711<>40713	192464	Hans Havermann	12/2019
3142	5*10^192422-43	192423	Robert Price	01/2019
3143	2^639110-2792441	192392	Enzo Doria	02/2016
3144	(241^80761-1)/240	192372	Anonymous	04/2024
3145	2^638955-29827	192345	Enzo Doria	08/2015
3146	15^163539+14	192337	Alfred Reich	10/2023
3147	2^638713-2784223	192272	Enzo Doria	10/2015
3148	(10^192216+7)/149	192214	Alfred Reich	07/2021
3149	2^638490-113507	192205	Enzo Doria	08/2014
3150	Phi(75881,561)	192120	Henri Lifchitz	12/2025
3151	2^638189-39943	192115	Enzo Doria	09/2015
3152	2^638110+1877119	192091	Enzo Doria	07/2016
3153	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
3154	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
3155	2^638066-2785211	192078	Enzo Doria	10/2015
3156	(35*10^191973-341)/9	191974	Robert Price	08/2021
3157	(112*10^191900+17)/3	191902	Robert Price	03/2020
3158	2^637475-115309	191900	Enzo Doria	07/2015
3159	(68*10^191754-113)/9	191755	Robert Price	03/2021
3160	2^636930-11	191736	Stefano Morozzi	07/2022
3161	(47*10^191732+259)/9	191733	Robert Price	03/2022
3162	41459^41522-41522^41459	191733	Norbert Schneider	04/2025
3163	2^636661+1876577	191655	Enzo Doria	07/2016
3164	(9^200807-2^200807)/7	191618	Jon Grantham	07/2023
3165	(34^125101-1)/33	191589	Paul Bourdelais	11/2017
3166	fibonacci(916540)-2	191546	Jon Grantham	08/2023
3167	2^636177-1855123	191509	Enzo Doria	09/2015
3168	2^636158-113627	191503	Enzo Doria	08/2014
3169	(37*25^136966+63)/4	191472	Curtis Bright	05/2015
3170	2^636035+79823	191466	Enzo Doria	06/2016
3171	2^636011-1860847	191459	Enzo Doria	11/2015
3172	2^635926-1860611	191433	Enzo Doria	11/2015
3173	3*2^635755+5	191382	Jon Grantham	07/2023
3174	3*10^191152-7	191153	Robert Price	08/2015
3175	2^634883-1865677	191119	Enzo Doria	02/2016
3176	2^634801+1871957	191095	Enzo Doria	05/2016
3177	(77*10^191080+157)/9	191081	Robert Price	05/2022
3178	(35*10^191073+1)/9	191074	Serge Batalov	07/2010
3179	9*10^191018-41	191019	Robert Price	08/2020
3180	2^634470-59861	190995	Enzo Doria	11/2015
3181	2^634368-29519	190964	Enzo Doria	08/2015
3182	(19*10^190935+11)/3	190936	Robert Price	07/2023
3183	2^634188-350609	190910	Enzo Doria	06/2015
3184	(65*10^190899+493)/9	190900	Robert Price	08/2021
3185	405^73192+404	190845	Alfred Reich	04/2026
3186	(62*10^190795-413)/9	190796	Robert Price	09/2021
3187	(26*10^190789-131)/3	190790	Robert Price	10/2019
3188	(13*10^190732-61)/3	190733	Robert Price	11/2018
3189	3*2^633524+5	190711	Jon Grantham	07/2023
3190	(7*10^190683+143)/3	190684	Robert Price	03/2018
3191	2^633088-113879	190579	Enzo Doria	10/2014
3192	2^633064+1874911	190572	Enzo Doria	06/2016
3193	5*3^399402+2^399402	190564	Jon Grantham	08/2023
3194	(43*10^190547+83)/9	190548	Robert Price	11/2018
3195	99*10^190543+7	190545	Robert Price	05/2021
3196	(299*10^190533+1)/3	190535	Robert Price	04/2020
3197	(1744*10^190519-1747)/3	190522	Robert Price	12/2020
3198	2^632815-15	190497	Stefano Morozzi	07/2022
3199	2^632795-351205	190491	Enzo Doria	06/2015
3200	41171^41272+41272^41171	190454	Norbert Schneider	05/2023
3201	(16*10^190420-19)/3	190421	Robert Price	02/2019
3202	(43*10^190351+101)/9	190352	Robert Price	11/2018
3203	2^632156+78391	190298	Enzo Doria	06/2016
3204	97*10^190295-3	190297	Robert Price	05/2020
3205	2^632082-1851971	190276	Enzo Doria	08/2015
3206	2^632020+1880311	190257	Enzo Doria	09/2016
3207	(5*10^190242-77)/9	190242	Robert Price	04/2021
3208	7*10^190210+13	190211	Robert Price	03/2021
3209	2^631637-462373	190142	Enzo Doria	08/2015
3210	2*10^190126-21	190127	Robert Price	09/2020
3211	(28*10^190105+191)/3	190106	Robert Price	02/2020
3212	2*10^190093+33	190094	Robert Price	11/2021
3213	(68*10^190053-113)/9	190054	Robert Price	03/2021
3214	2^631183+213413	190006	Enzo Doria	09/2023
3215	2^631122-39251	189987	Enzo Doria	08/2015
3216	(26*10^189928-89)/9	189929	Robert Price	06/2018
3217	2^630839-97	189902	Yves Minet	07/2017
3218	99*10^189876-7	189878	Robert Price	07/2020
3219	41147^41147+30^30	189867	Henri Lifchitz	09/2024
3220	2^630359+1788953	189757	Enzo Doria	05/2016
3221	2^630228+1871971	189718	Enzo Doria	05/2016
3222	2^630108+781	189682	Lelio R Paula	08/2013
3223	2^629870-1867811	189610	Enzo Doria	04/2016
3224	(359^74189-1)/358	189558	Alexander Zhirkov	11/2017
3225	2^629326+2792929	189447	Enzo Doria	02/2016
3226	4*10^189401+13	189402	Robert Price	02/2021
3227	(10^189385-61)/3	189385	Serge Batalov	12/2014
3228	2^629036+1874011	189359	Enzo Doria	06/2016
3229	2^628930+80779	189327	Enzo Doria	07/2016
3230	(134*10^189309-11)/3	189311	Robert Price	01/2022
3231	9*10^189306-11	189307	Mischa Rodermond	04/2023
3232	3^396740-396740^3	189294	Henri Lifchitz	07/2024
3233	2^628582+1179439	189223	Enzo Doria	06/2016
3234	(44*10^188999-503)/9	189000	Robert Price	12/2018
3235	(16*10^188823+167)/3	188824	Robert Price	06/2019
3236	(10^188796+7)/4967/71933	188788	Alfred Reich	08/2021
3237	2^627037-2785843	188757	Enzo Doria	10/2015
3238	(10^188566+7)/311640753181661	188552	Alfred Reich	04/2022
3239	(16*10^188457+161)/3	188458	Robert Price	02/2019
3240	L(901657)	188436	Renaud Lifchitz	11/2008
3241	(19*10^188375+137)/3	188376	Robert Price	03/2022
3242	2^625651+74213	188340	Enzo Doria	04/2016
3243	2^625584-460919	188320	Enzo Doria	06/2015
3244	(8*10^188308-71)/9	188308	Serge Batalov	11/2022
3245	5^269399-3^269399-1	188302	Jon Grantham	08/2023
3246	(14*10^188218+139)/9	188219	Robert Price	11/2021
3247	40760^40821-40821^40760	188195	Norbert Schneider	07/2024
3248	(10^188164+359)/9	188164	Serge Batalov	12/2014
3249	2^624481-113611	187988	Enzo Doria	08/2014
3250	(2^624389+125582)/2	187960	Stefano Morozzi	09/2019

Find by discoverer :

PRP Records

Probable Primes Top 10000

(303330 PRPs in the top)