Mersenne numbers with smoothest P-1 factors:
Top 707 factors (top 100 per 10M range) listed here
Exponent Factor Bits min B1 min B2 Ratio ↑k (factored)
M52,776,323119258580654584293749799284701143106.563,7974,12938.753 × 13 × 293 × 653 × 1399 × 2539 × 2719 × 3797 × 4129
M48,222,6614528148250092064785588230063324247111.802,5314,63941.4913 × 61 × 67 × 167 × 379 × 409 × 1193 × 2437 × 2531 × 4639
M56,198,1615357931043393305995499945118950967112.0518,18122,511200.9133 × 19 × 173 × 367 × 457 × 1229 × 6367 × 18181 × 22511
M74,273,70112334772683757575606258048842485297113.2519,23128,771254.0523 × 72 × 11 × 232 × 199 × 229 × 967 × 1493 × 19231 × 28771
M89,117,659178766757299808670411303745593708897117.117,04331,607269.9024 × 3 × 23 × 29 × 41 × 233 × 2027 × 2269 × 3203 × 7043 × 31607
M5,172,347103093565702596213136062937255881106.3526,56929,131273.9322 × 3 × 5 × 11 × 17 × 47 × 67 × 1632 × 179 × 211 × 9649 × 29131
M60,520,6675638967536372193527451825872014401112.1212,32332,717291.8125 × 52 × 47 × 127 × 1571 × 2683 × 5741 × 12323 × 32717
M75,146,339463495147630732740159766031925089108.5175132,059295.4424 × 11 × 43 × 67 × 109 × 139 × 149 × 317 × 353 × 751 × 32059
M90,976,649804619004999167793536922369158447109.3125,34333,529306.733 × 31 × 103 × 139 × 631 × 661 × 9371 × 25343 × 33529
M59,617,253136639814885383811919763603126849106.759,83933,013309.2525 × 3 × 233 × 3797 × 4261 × 9749 × 9839 × 33013
M48,954,137266889392008723765175705929638483071117.689,90736,997314.385 × 101 × 151 × 1103 × 1801 × 6547 × 7499 × 9907 × 36997
M2,291,35310277953410493013333885372395879103.0222,62134,847338.263 × 127 × 269 × 449 × 6421 × 9629 × 22621 × 34847
M59,702,5091477841722889769167741163618156121110.1926,40739,799361.1922 × 3 × 5 × 347 × 5351 × 9199 × 11491 × 26407 × 39799
M45,428,9692150503706360918833024973950588033110.7331,05140,163362.7226 × 32 × 23 × 31 × 2467 × 3617 × 5179 × 31051 × 40163
M65,712,761406440069605650589975828525174369681118.2923,67744,771378.4823 × 5 × 72 × 29 × 397 × 3259 × 6121 × 6481 × 23677 × 44771
M56,916,199192514199269068153431847285313537107.259,64343,891409.25211 × 33 × 7 × 11 × 227 × 1931 × 2141 × 9643 × 43891
M91,118,239342746434535567036535543246292177108.0829,59945,139417.6523 × 3 × 269 × 3581 × 7507 × 8111 × 29599 × 45139
M3,305,8736999440290894365093551488666249102.4737,13943,051420.1522 × 32 × 132 × 211 × 18301 × 28183 × 37139 × 43051
M75,415,0993454265016169767652434176688811726871121.3852,22354,449448.595 × 172 × 37 × 197 × 691 × 23209 × 47681 × 52223 × 54449
M56,599,6491037889747033483280016571922085047109.687,63949,253449.073 × 7 × 191 × 593 × 599 × 2731 × 6263 × 7639 × 49253
M52,498,609159923603802970416594636545249777106.9821,85950,951476.2723 × 71 × 151 × 439 × 2371 × 15319 × 21859 × 50951
M90,441,45711763897479847783263590312734545874257123.1558,07360,901494.5423 × 7 × 13 × 31 × 3229 × 4933 × 5867 × 8719 × 58073 × 60901
M63,209,42917625966752218775515724347768892216441123.7365,35370,879572.8622 × 5 × 31 × 491 × 35969 × 49333 × 55721 × 65353 × 70879
M73,053,97152921701284535770236791013085597857115.3524,47366,791579.0324 × 32 × 11 × 13 × 103 × 109 × 547 × 631 × 2777 × 24473 × 66791
M984,12721584647209573989412111077637857104.0947,90364,817622.7024 × 7 × 421 × 1427 × 4663 × 11257 × 47903 × 64817
M82,247,7615522397178753104000147762025421191112.0919,42770,051624.963 × 5 × 17 × 743 × 2081 × 7901 × 7919 × 19427 × 70051
M57,549,707291214683164182382397569604004703107.8470,90170,921657.637 × 23 × 109 × 193 × 2221 × 66889 × 70901 × 70921
M51,738,2772237691122486371975036158796661402521120.7548,88380,141663.6922 × 3 × 5 × 11 × 2039 × 4919 × 28549 × 29209 × 48883 × 80141
M73,952,387106634068595070890710224993448872191116.3681,61981,701702.145 × 41 × 107 × 10273 × 12577 × 38149 × 81619 × 81701
M92,215,891137862184728653098584660765343138081116.7314,14382,609707.6924 × 3 × 5 × 83 × 1072 × 233 × 2003 × 6011 × 14143 × 82609
M42,573,6472440020616846013523379928850133681110.9162,29982,559744.3723 × 3 × 5 × 31 × 3319 × 19597 × 23027 × 62299 × 82559
M76,656,00189404804980321142562090118479945708207126.0764,92194,771751.7211 × 23 × 53 × 1151 × 8737 × 11159 × 62989 × 64921 × 94771
M46,153,313157979407607287535481914027584519106.9633,76983,389779.623 × 13 × 241 × 577 × 10079 × 11119 × 33769 × 83389
M51,985,771177127637427533054179698838836487107.1368,53984,509788.873 × 89 × 317 × 367 × 439 × 21569 × 68539 × 84509
M81,616,159228866583165030013330196116948697107.5024,00186,461804.3222 × 19 × 47 × 2309 × 4073 × 20113 × 24001 × 86461
M8,282,299326504499056559369359761984776247108.0171,33387,803812.923 × 13 × 37 × 233 × 337 × 967 × 28723 × 71333 × 87803
M48,200,59727234383149634366797154902832280871114.3974,70797,379851.283 × 5 × 11 × 232 × 71 × 79 × 3821 × 20759 × 74707 × 97379
M57,192,763156518777998003841349298880603527106.9544,77191,283853.5332 × 7 × 71 × 103 × 113 × 419 × 15349 × 44771 × 91283
M46,400,171779595738523901464404842200361872513119.2319,759102,107856.3926 × 32 × 31 × 71 × 607 × 853 × 1747 × 3631 × 19759 × 102107
M54,342,8531331604766510526937562485537269809110.0494,24994,249856.5223 × 32 × 29 × 107 × 3072 × 1091 × 2803 × 6673 × 28513
M54,865,417163676514872886603225439732333201107.0114,41994,009878.4923 × 33 × 52 × 7 × 541 × 4523 × 11897 × 14419 × 94009
M90,960,127332102845327911778348547844397153108.0365,62996,431892.6024 × 3 × 7 × 17 × 19 × 277 × 2687 × 3571 × 65629 × 96431
M71,694,323572577662157733832652042621694583329118.7953,089106,501896.5924 × 37 × 732 × 457 × 2543 × 3259 × 53089 × 106501
M5,918,3214435680455395553485087393921739743111.7795,393101,477907.893 × 7 × 73 × 373 × 757 × 5807 × 15401 × 95393 × 101477
M69,295,319587203703783754871232724171531368401118.8236,109110,849932.9023 × 32 × 52 × 172 × 37 × 67 × 27487 × 29863 × 36109 × 110849
M68,428,097717071292630869319615252743292929109.1439,241102,587939.92210 × 13 × 432 × 2683 × 19709 × 39241 × 102587
M79,233,487383158078010590637825053043812564511118.2117,509113,063956.505 × 61 × 181 × 389 × 2423 × 2953 × 7949 × 17509 × 113063
M64,189,469303015439271262882206202591782497107.9031,769104,891972.1024 × 3 × 23 × 2699 × 10627 × 22369 × 31769 × 104891
M75,647,86165425101129262636354434719509632991115.6677,557112,543973.0932 × 5 × 11 × 532 × 127 × 5821 × 48197 × 77557 × 112543
M3,870,56336174716570195216701279948305449104.8452,237103,007982.5722 × 31 × 37 × 199 × 257 × 479 × 7727 × 52237 × 103007

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