Mersenne numbers with smoothest P-1 factors:
Top 2,509 factors (top 100 per 10M range) listed here
ExponentFactor Bits min B1 min B2 Ratio k (factored)
M940,216,091328338204996470666551756781.44269,3936,481,528,54179,585,125.16269393 × 6481528541
M901,000,03126627607365463963329822060987.781,362,21122,449,467255,738.0525 × 151 × 1362211 × 22449467
M887,184,833966116281943817237875192983.0077376,562,829,613922,460,722.2322 × 23 × 773 × 76562829613
M870,000,0492325527766857143485147540184.275,71110,555,879125,268.9022 × 3 × 52 × 739 × 5711 × 10555879
M867,000,083961414077040220771436238382.9969,427963,34911,607.8132 × 61 × 151 × 69427 × 963349
M840,859,4331517301594672177232530864183.657871,327,87115,874.1924 × 33 × 5 × 7 × 571 × 787 × 1327871
M815,484,517561518663247161118521015382.2214,24962,983766.0722 × 251 × 3821 × 14249 × 62983
M750,000,08989143030067219060351137612189.531,181384,0294,289.5722 × 5 × 347 × 349 × 541 × 1181 × 384029
M731,000,08966210355415659597789235459949781217115.672,075,19749,780,219430,354.4124 × 33623 × 814903 × 2075197 × 49780219
M726,064,7631070238506002767618041698383.15146,407314,0033,776.5232 × 47 × 379 × 146407 × 314003
M726,064,763717011239666443858250452782.573,4814,673,19156,597.903 × 23 × 53 × 592 × 83 × 4673191
M701,000,023870756753766922045014024782.85502,9191,764,219,99721,294,520.237 × 502919 × 1764219997
M690,009,941914632054107011815654351982.9298368,103,959,447821,326,558.5432 × 11 × 983 × 68103959447
M670,616,62114416291764357335305591511386.90140,527203,9092,346.5422 × 349 × 2687 × 140527 × 203909
M670,000,103155748121166306621944879980.371135,221,188,879,001438,262,608,752.123 × 11 × 35221188879001
M666,666,8298653438373913093632798476186.1620,23161,651715.5322 × 5 × 11 × 17 × 13913 × 20231 × 61651
M663,021,3771253741940896795854823807983.3713727,289,429,170,9398,723,169,891,776.5813 × 727289429170939
M662,103,769239258210812284002570901780.981,5231,142,00314,101.4422 × 3 × 7 × 83 × 149 × 1523 × 1142003
M662,100,059116873742319842468385255179.95335,3834,576,72157,243.9152 × 23 × 335383 × 4576721
M640,402,45725224408083194361139909969108797.67224,6994,574,42946,835.213 × 13 × 59 × 83269 × 224699 × 4574429
M601,246,4216097528069126908900690382627129102.27820,60962,098,489607,224.7722 × 3 × 47 × 176431 × 820609 × 62098489
M600,000,88910765401528120351378612508986.489,52119,309223.2924 × 32 × 11 × 239 × 1289 × 9521 × 19309
M600,000,017460234509376290036195524981.931,0394,568,472,48155,761,602.8923 × 101 × 1039 × 4568472481
M577,777,77714208317633332733265225951551519103.49578,4835,385,26952,038.3737357 × 105653 × 578483 × 5385269
M563,021,377498250175761694716986787982.04105,25314,013,184,573170,802,626.383 × 105253 × 14013184573
M563,000,051168208353932773599324787180.4849159,371,243737,746.125 × 37 × 277 × 491 × 59371243
M546,000,0012798828082964810582220424784.53228,049342,1014,046.9532 × 173 × 211 × 228049 × 342101
M515,000,0331807954435175800127155731604193.87306,853848,7799,042.2322 × 5 × 31 × 71 × 1531 × 306853 × 848779
M511,257,78768180993615148074931536979.177,04323,057291.2222 × 661 × 1553 × 7043 × 23057
M507,000,04196442159586922565968396179.673,259374,153,6394,696,056.3222 × 3 × 5 × 13 × 3259 × 374153639
M502,000,0272107472748472812989445447752584121110.70113,7771,099,0819,928.5422 × 5 × 3089 × 12569 × 21617 × 113777 × 1099081
M501,000,55155777968827293937935111978.8829914,065,260,00111,587,454,720.563 × 7 × 29 × 914065260001
M501,000,18776500060133477226154875979.341,8671,87323.6131 × 61 × 263 × 439 × 1867 × 1873
M500,000,507451943625609763382143183981.90643334,698,339,1394,086,550,201.803 × 7 × 643 × 334698339139
M500,000,489521840337830032466326213782.1136,563933,88311,373.5822 × 13 × 2939 × 36563 × 933883
M490,000,0037042681756227296402271287352795.831,126,51345,898,729478,959.363 × 463291 × 1126513 × 45898729
M487,001,66319391769989354962825255038520997.2945,751100,9311,037.4122 × 32 × 134 × 19 × 2207 × 45751 × 100931
M483,000,041122871208868895186508678271989.99250,5012,486,75327,633.9073 × 83 × 337 × 250501 × 2486753
M471,000,04347382115420147386802828714388.6116,529699,9477,898.7932 × 293 × 16487 × 16529 × 699947
M464,000,0215620807334203251639797407385.543,22963,576,391743,244.6722 × 3 × 23 × 1069 × 3229 × 63576391
M461,000,02754649081837090536360960178.851,0247,717,749,94397,873,243.65210 × 3 × 52 × 7717749943
M435,964,95148881761530185297606954378.693118,084,378,268,091229,807,360,584.2231 × 18084378268091
M423,000,089799928131456774817972215182.739,22173,375,433886,967.8852 × 13 × 43 × 9221 × 73375433
M419,491,00155845087776285686191247378.8977,924,156,560,479100,451,017,982.3922 × 3 × 7 × 7924156560479
M414,000,1271700040721294327606826059120193.7889,4131,163,65112,408.3724 × 52 × 7 × 11 × 43 × 149 × 89413 × 1163651
M410,000,02925994712244765216251400176787.7561912,555,743143,088.0832 × 73 × 73 × 181 × 619 × 12555743
M407,363,239246008340615974546326564781.02508,10310,407,589128,449.14571 × 508103 × 10407589
M405,000,13988080231013648057858759979.54808,3693,135,64139,420.623 × 11 × 13 × 808369 × 3135641
M402,637,27376864089269494321064491379.354,3396,77985.4423 × 3 × 7 × 419 × 461 × 4339 × 6779
M402,637,12730715760562562142163990594934080751114.56416,989133,896,2471,168,740.8132 × 53 × 72 × 17 × 89 × 8191 × 416989 × 133896247

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