Mersenne numbers with smoothest P-1 factors:
Top 2,242 factors (top 100 per 10M range) listed here
Exponent Factor Bits min B1 min B2 Ratiok (factored)
M215,000,0337007775167522530363036775.891162,971,490,509,5512,147,431,001,458.88162971490509551
M217,220,9896476387722238263993211975.781149,073,709,498,6311,967,252,787,778.49149073709498631
M350,166,16329631442105502996319475977.973141,035,148,626,0111,808,804,419,607.133 × 141035148626011
M202,000,3975176311109742219507392775.451128,126,260,804,8791,698,063,447,382.34128126260804879
M350,385,72741407854419119695178531178.455118,177,914,305,0531,506,329,017,893.275 × 118177914305053
M350,006,31730960440348816775412331978.03763,183,431,769,761809,683,042,699.837 × 63183431769761
M211,000,00726127065835997559225404177.79530,956,238,115,193397,946,797,448.0722 × 5 × 30956238115193
M194,923,5174971677784768875077567175.40525,505,787,404,651338,290,311,972.775 × 25505787404651
M197,794,0213634245939394830124717774.94422,967,364,742,757306,460,050,455.5422 × 22967364742757
M190,973,4676066090727637369603953775.68819,852,531,162,213262,310,989,149.9023 × 19852531162213
M195,476,0777636387996382265570782376.021117,757,085,706,713233,598,811,325.5911 × 17757085706713
M222,934,7277385660361174172463133775.97413,803,854,272,657181,708,214,403.7722 × 3 × 13803854272657
M398,000,06945015526491883627442992178.57167,069,019,894,42389,965,519,410.1024 × 5 × 7069019894423
M350,282,07720281414996461103122921777.42166,031,274,604,62377,898,782,099.6024 × 3 × 6031274604623
M192,949,4094520595952443158127871975.2675,578,313,896,93174,121,620,093.083 × 7 × 5578313896931
M222,976,5975792128722873978066571375.6285,411,749,484,77771,568,356,690.3623 × 3 × 5411749484777
M223,188,6615881544055019826100178375.64274,880,063,441,05364,518,150,784.9633 × 4880063441053
M222,852,6594826603669679112889531975.35234,708,320,161,08762,483,159,461.2823 × 4708320161087
M201,000,34317158747547508783818180977.18134,104,171,035,85753,174,346,581.8923 × 13 × 4104171035857
M222,976,3095760409811122715529405775.6193,588,080,374,09747,455,988,743.1322 × 32 × 3588080374097
M222,960,6675017039701713556551842375.41172,206,069,097,48329,254,620,189.523 × 17 × 2206069097483
M197,612,8515167785734005179106723975.45231,895,004,425,10125,115,375,611.853 × 23 × 1895004425101
M203,000,4895747911792733543128144175.61161,769,673,013,18123,406,683,942.8724 × 5 × 1769673013181
M193,536,53330052955534042834487239977.994671,662,560,108,00921,317,099,706.66467 × 1662560108009
M391,723,41136732725431164009202895978.28531,263,774,883,15916,143,997,008.397 × 53 × 1263774883159
M222,874,5376976464465805790723728775.881311,194,740,652,16915,744,112,846.16131 × 1194740652169
M190,571,5095172771442388681055155375.451281,060,291,674,91314,052,279,946.8627 × 1060291674913
M193,040,5093259433205182020553551374.7971,005,042,321,25113,438,723,233.6722 × 3 × 7 × 1005042321251
M221,983,2414762537109016051764656975.3327993,263,401,90313,184,769,758.6822 × 33 × 993263401903
M195,245,0474038160730145301424904175.108861,771,910,09311,475,585,571.4723 × 3 × 5 × 861771910093
M191,059,9375195959601157229839712175.4632849,857,589,64311,262,387,339.3525 × 5 × 849857589643
M350,211,39158073942266857739998895178.9449676,838,347,1818,573,842,996.7752 × 72 × 676838347181
M197,485,0637264868858232341732445775.9481567,699,511,2197,475,301,985.2022 × 34 × 567699511219
M222,819,3615911718405955330133063975.6527446,657,231,4075,904,572,048.2233 × 11 × 446657231407
M222,840,7034813418636764634575851175.3517423,534,642,9675,620,936,508.313 × 5 × 17 × 423534642967
M213,906,8596844860697744277692624975.8611404,031,031,1415,326,188,638.0222 × 32 × 11 × 404031031141
M194,292,5836583531051558801929372175.807403,388,376,7015,321,656,553.7522 × 3 × 5 × 7 × 403388376701
M350,111,47737946901614611888979491978.33491367,906,305,4794,696,976,350.403 × 491 × 367906305479
M500,000,507451943625609763382143183981.90643334,698,339,1394,086,550,201.803 × 7 × 643 × 334698339139
M198,042,7274883149344976638156487975.3753258,459,639,5413,429,200,621.7632 × 53 × 258459639541
M391,000,033152920776253803468245951380.34139270,546,275,9693,367,555,960.0422 × 13 × 139 × 270546275969
M218,174,0514543486479481848402307975.27139249,700,892,0173,317,569,277.063 × 139 × 249700892017
M191,503,85910484285160433399164600776.47379240,752,516,0413,148,220,352.783 × 379 × 240752516041
M350,282,07720962020140410491972320977.47307243,661,467,3593,145,150,216.1722 × 307 × 243661467359
M222,931,6495268862989500159291248975.4819172,766,318,7592,288,904,681.0822 × 32 × 19 × 172766318759
M221,988,1216729207639610781726223175.8361165,646,820,5612,184,367,463.943 × 5 × 61 × 165646820561
M200,765,3334138875011186830955431975.1371161,310,535,9572,147,038,184.6232 × 71 × 161310535957
M321,797,123183598398036895594998676180.60967147,502,800,2091,829,995,352.8922 × 5 × 967 × 147502800209
M350,245,68126322661498128953038208977.80739127,122,546,7791,633,952,213.0722 × 739 × 127122546779
M192,084,3596744095422668607046426375.841,499117,111,643,3911,544,274,182.851499 × 117111643391

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