GIMPS (Prime95) Mersenne numbers with smoothest P-1 factors

Mersenne numbers with smoothest P-1 factors:

Top 2,509 factors (top 100 per 10M range) listed here

Exponent	Factor	Bits	min B1 ↓	min B2	Ratio	k (factored)
M199,684,157	41600559978000438285047	75.14	99,829	3,059,951	40,723.86	11 × 31 × 99829 × 3059951
M132,034,519	16156922101158205895089	73.77	997	12,497	169.39	2³ × 3 × 11² × 19 × 89 × 997 × 12497
M193,024,739	133779992939397918432247	76.82	997	68,515,397	891,846.44	3 × 19 × 89 × 997 × 68515397
M335,429,231	721365617174754483306832930801	99.19	99,317	190,529	1,920.91	2³ × 3 × 5² × 149 × 563 × 1129 × 99317 × 190529
M200,679,931	37103553502058984776487	74.97	9,931	714,569	9,530.89	7 × 1861 × 9931 × 714569
M140,140,387	21723642591114243168161	74.20	9,929	35,521	478.71	2⁴ × 5 × 41 × 67 × 9929 × 35521
M332,352,467	795974427811155985057435484609	99.33	99,223	176,051	1,772.41	2⁵ × 467 × 1733 × 2647 × 99223 × 176051
M167,997,311	66341406760760958885887	75.81	9,901	72,229	952.73	17 × 109 × 149 × 9901 × 72229
M194,054,183	55132785687164973107687	75.55	9,901	921,073	12,192.32	37 × 421 × 9901 × 921073
M347,169,761	870446019788671610741693857	89.49	9,883	50,085,319	559,663.25	2⁴ × 3 × 19 × 2777 × 9883 × 50085319
M20,884,247	40427701109474608972841	75.10	983	1,109	14.77	2² × 5 × 7² × 17 × 137 × 389 × 983 × 1109
M88,580,683	85162393342489318485481	76.17	983	1,229	16.13	2² × 3⁴ × 5 × 23 × 59 × 181 × 983 × 1229
M97,900,973	8731727413141327296257	72.89	983	2,017	27.67	2⁷ × 199 × 883 × 983 × 2017
M209,579,779	42668895203841578947057	75.18	983	182,131	2,422.74	2³ × 3² × 53 × 149 × 983 × 182131
M690,009,941	9146320541070118156543519	82.92	983	68,103,959,447	821,326,558.54	3² × 11 × 983 × 68103959447
M332,320,061	606056377648832009439919	79.00	9,829	424,903	5,378.26	3 × 7 × 37 × 281 × 9829 × 424903
M93,731,039	5616998848196231929405561	82.22	977	2,467	30.01	2² × 3² × 5 × 7² × 67 × 109 × 193 × 977 × 2467
M101,788,769	532172625326763177271687	78.82	977	3,083	39.12	3 × 37 × 43 × 349 × 521 × 977 × 3083
M185,668,669	60776366884273341843193	75.69	97,463	289,733	3,828.10	2² × 3² × 7 × 23 × 97463 × 289733
M80,751,877	5717630817680006415217	72.28	971	1,931	26.72	2³ × 3 × 13 × 73 × 829 × 971 × 1931
M134,924,593	27473112769473067394351	74.54	971	4,603	61.75	5² × 41 × 71 × 313 × 971 × 4603
M179,951,591	40992633693674383989673	75.12	971	1,439	19.16	2² × 3⁴ × 47 × 53 × 101 × 971 × 1439
M332,259,013	5729632648297935533618881	82.24	971	6,829	83.03	2⁵ × 3 × 5 × 11 × 383 × 643 × 971 × 6829
M2,487,493	762204282127091777	59.40	97	191	3.22	2⁵ × 7 × 19 × 29 × 67 × 97 × 191
M184,296,451	39056185948240320023711	75.05	97	8,365,229	111,465.09	5 × 7² × 13 × 41 × 97 × 8365229
M179,979,049	86131818003932445154951	76.19	9,697	75,479	990.68	3² × 5² × 1453 × 9697 × 75479
M222,889,291	62637124234020366311383	75.73	967,361	2,848,091	37,608.77	3 × 17 × 967361 × 2848091
M46,850,291	916014411189763715881	69.63	967	1,051	15.09	2² × 3³ × 5 × 47 × 379 × 967 × 1051
M123,390,247	10596832284288400147649	73.17	967	3,041	41.56	2⁵ × 7 × 19 × 47 × 73 × 967 × 3041
M131,294,249	18315476626986131228063	73.96	967	9,319	126.01	7 × 41 × 149 × 181 × 967 × 9319
M168,432,683	36694344527426006536961	74.96	967	30,841	411.44	2⁷ × 5 × 13 × 439 × 967 × 30841
M321,797,123	1835983980368955949986761	80.60	967	147,502,800,209	1,829,995,352.89	2² × 5 × 967 × 147502800209
M138,335,929	13132992736102480484801	73.48	9,629	21,031	286.23	2⁵ × 5² × 293 × 9629 × 21031
M203,693,003	38372489991062555624687	75.02	9,629	67,723	902.70	13 × 41 × 271 × 9629 × 67723
M37,181,953	54935792106123734722337	75.54	961	961	12.72	2⁴ × 7 × 19 × 31² × 67 × 79 × 139 × 491
M89,586,439	100132045100686786092361	76.41	961	961	12.58	2² × 3 × 5 × 7 × 13 × 31² × 47 × 67 × 149 × 227
M94,744,453	4810819631746494538873	72.03	961	961	13.34	2² × 3⁵ × 7² × 31² × 41 × 83 × 163
M139,999,609	439364897295107750476537	78.54	961	961	12.24	2² × 3 × 13 × 31² × 97 × 223 × 673 × 719
M151,576,771	19121904695753792528023	74.02	961	961	12.98	3⁶ × 7 × 31² × 109 × 197 × 599
M194,513,927	60855198620952323273897	75.69	9,601	34,228,949	452,238.67	2² × 7 × 17 × 9601 × 34228949
M203,580,449	49081254598419908961281	75.38	9,547	83,597	1,109.04	2⁹ × 5 × 59 × 9547 × 83597
M22,954,297	241658177651949605431	67.71	953	1,009	14.90	3 × 5 × 13 × 67 × 419 × 953 × 1009
M28,991,969	26568026025616717960481	74.49	953	1,193	16.02	2⁴ × 5 × 109 × 113 × 409 × 953 × 1193
M41,940,791	3399243260449425960143	71.53	953	1,039	14.53	11 × 13 × 29 × 71 × 139 × 953 × 1039
M58,562,821	8202352587123035764267727	82.76	953	2,311	27.92	7² × 41 × 53 × 523 × 571 × 953 × 2311
M105,333,919	63396699538781123747377	75.75	953	2,389	31.54	2³ × 3 × 23² × 29 × 359 × 953 × 2389
M134,868,733	12056691704009975885377	73.35	953	971	13.24	2⁵ × 3² × 367 × 457 × 953 × 971
M210,454,259	90553093431416619029759	76.26	953	225,747,357,677	2,960,186,974.74	953 × 225747357677
M600,000,889	107654015281203513786125089	86.48	9,521	19,309	223.29	2⁴ × 3² × 11 × 239 × 1289 × 9521 × 19309
M147,378,617	17356676027078770290631	73.88	9,511	20,047	271.35	3² × 5 × 6863 × 9511 × 20047

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0M	<	10¹⁰	All tracked exponents
0M	<	2³²	GPU TF range
0M	<	1000M	PrimeNet range
0M	<	193M	low-PrimeNet, low-res
0M	<	385M	low-PrimeNet, high-res
50M	<	146M	PrimeNet wavefront