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

Mersenne numbers with smoothest P-1 factors:

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

Exponent	Factor	Bits	min B1 ↓	min B2	Ratio	k (factored)
M43,148,921	82568328725971289068489	76.13	397	409	5.37	2² × 3² × 97 × 109 × 113 × 137 × 397 × 409
M93,429,073	20918807476342068975361	74.15	373	419	5.65	2⁷ × 3 × 5 × 7 × 223 × 239 × 373 × 419
M2,408,587	8185812272861618401	62.83	361	361	5.75	2⁴ × 3 × 5² × 19² × 83 × 167 × 283
M14,726,497	95774964577027382351	66.38	361	361	5.44	5² × 11 × 19² × 23 × 47 × 157 × 193
M5,455,771	5425367152871346913	62.23	343	343	5.51	2⁴ × 3³ × 7³ × 11 × 29 × 67 × 157
M59,059,183	36067595474201584451929	74.93	343	343	4.58	2² × 3 × 7³ × 11 × 41 × 73 × 103 × 131 × 167
M106,798,873	34273537449197106442537	74.86	343	343	4.58	2² × 3² × 7³ × 11 × 109 × 137 × 239 × 331
M3,290,201	4680302928890866481	62.02	337	353	5.69	2³ × 5 × 7 × 131 × 163 × 337 × 353
M3,562,499	3043646638758433951	61.40	293	331	5.39	3 × 5² × 11 × 19 × 281 × 293 × 331
M13,035,833	1077166343714454026287	69.87	293	353	5.05	3 × 11 × 29 × 47 × 83 × 107 × 293 × 353
M70,349,033	9022485120260285214377	72.93	293	347	4.76	2² × 11 × 17² × 193 × 257 × 293 × 347
M78,531,413	38760879220416200615441	75.04	293	383	5.10	2³ × 5 × 59 × 83 × 103 × 109 × 293 × 383
M1,173,631	298069494497906311	58.05	289	289	4.98	3² × 5 × 17² × 137 × 263 × 271
M2,005,919	461219833157727601	58.68	289	289	4.93	2³ × 3³ × 5² × 11 × 17² × 37 × 181
M2,321,587	2326406145317117473	61.01	289	337	5.52	2⁴ × 3 × 7 × 17² × 61 × 251 × 337
M68,398,349	54386158460740668372823	75.53	289	439	5.81	3 × 11² × 17² × 163 × 211 × 251 × 439
M10,141,069	157488245982319323457	67.09	281	347	5.17	2⁵ × 3⁵ × 7² × 11 × 19 × 281 × 347
M20,005,159	91186955491077499993	66.31	281	317	4.78	2² × 3 × 79 × 137 × 197 × 281 × 317
M550,163	13306443213105864431	63.53	271	349	5.49	5 × 7² × 43 × 53 × 229 × 271 × 349
M43,401,373	690839344386318969521	69.23	271	383	5.53	2³ × 5 × 7 × 17 × 89 × 181 × 271 × 383
M2,324,899	588755146683879001	59.03	269	293	4.96	2² × 3³ × 5³ × 7 × 17 × 269 × 293
M11,802,191	106051542594606125191	66.52	269	293	4.40	3³ × 5 × 31 × 53 × 257 × 269 × 293
M8,809,187	54753787839708292609	65.57	256	317	4.83	2⁸ × 3² × 7 × 13 × 19 × 23 × 107 × 317
M59,149	1979421682481281	50.81	251	293	5.77	2⁶ × 3² × 5 × 79 × 251 × 293
M823,337	555093865146272743	58.95	251	271	4.60	3⁴ × 17 × 59 × 61 × 251 × 271
M913,337	238309974960036751	57.73	243	243	4.21	3⁵ × 5³ × 113 × 191 × 199
M6,943,661	26734505104771635601	64.54	243	243	3.77	2³ × 3⁵ × 5² × 11 × 13 × 19 × 61 × 239
M8,115,551	15404736486637271071	63.74	243	243	3.81	3⁵ × 5 × 11² × 29 × 31 × 43 × 167
M21,026,741	97841706476873269087	66.41	243	311	4.68	3⁵ × 11² × 43 × 61 × 97 × 311
M55,645,649	1775111898489498680401	70.59	241	359	5.09	2³ × 3² × 5² × 23 × 61 × 73 × 241 × 359
M2,841,031	42963088389080453983	65.22	239	313	4.80	3³ × 23 × 37 × 53 × 83 × 239 × 313
M122,878,537	10138329352621125997447	73.10	239	277	3.79	3 × 7² × 107 × 173 × 229 × 239 × 277
M138,742,759	16464978141809732373551	73.80	239	251	3.40	5² × 19 × 71 × 139 × 211 × 239 × 251
M4,531,217	30265830790572129457	64.71	233	373	5.76	2³ × 3 × 11 × 19 × 47 × 163 × 233 × 373
M7,174,529	56272457791740509201	65.61	233	311	4.74	2³ × 5² × 7 × 29 × 31 × 43 × 233 × 311
M58,980,811	3326153351927425943351	71.49	233	269	3.76	5² × 7 × 17 × 37 × 61 × 67 × 233 × 269
M98,921,051	19645838178727069884761551	84.02	229	281	3.34	3³ × 5² × 7 × 13² × 17 × 19 × 31 × 193 × 229 × 281
M19,570,253	98571626659985089313	66.42	227	353	5.31	2⁴ × 13² × 59 × 197 × 227 × 353
M8,812,361	23695976893393170857	64.36	223	229	3.56	2² × 7 × 53 × 113 × 157 × 223 × 229
M7,926,761	11307114440999064743617	73.26	211	401	5.47	2⁵ × 3³ × 11 × 47 × 113 × 167 × 211 × 401
M389,531	40042114721043137	55.15	199	293	5.31	2⁵ × 13² × 163 × 199 × 293
M31,693,309	11575766348188992230711	73.29	199	257	3.51	5 × 11 × 13 × 19 × 31 × 61 × 139 × 199 × 257
M2,692,643	1975009389346444273	60.78	197	271	4.46	2³ × 3 × 17 × 113 × 149 × 197 × 271
M3,658,201	3246318301614740657	61.49	193	223	3.63	2³ × 73 × 127 × 139 × 193 × 223
M60,383	1291712743872799	50.20	191	223	4.44	3 × 13 × 47 × 137 × 191 × 223
M1,040,159	154887933065842943	57.10	191	223	3.91	7 × 29 × 79 × 109 × 191 × 223
M10,200,797	122783671423023965089	66.73	191	277	4.15	2⁴ × 3 × 7 × 31 × 67 × 163 × 191 × 277
M20,045,497	144188351771959714081	66.97	191	241	3.60	2⁴ × 3 × 5 × 43 × 67 × 113 × 191 × 241
M49,839,809	18340545274689165092713	73.96	191	347	4.69	2² × 3³ × 7 × 23 × 43 × 47 × 79 × 191 × 347
M7,536,869	31487662752024415591	64.77	181	277	4.28	3² × 5 × 89 × 101 × 103 × 181 × 277

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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	<	123M	PrimeNet wavefront