Mersenne numbers with smoothest P-1 factors:
Top 2,509 factors (top 100 per 10M range) listed here
Exponent Factor Bits min B1min B2 Ratio k (factored)
M199,684,1574160055997800043828504775.1499,8293,059,95140,723.8611 × 31 × 99829 × 3059951
M132,034,5191615692210115820589508973.7799712,497169.3923 × 3 × 112 × 19 × 89 × 997 × 12497
M193,024,73913377999293939791843224776.8299768,515,397891,846.443 × 19 × 89 × 997 × 68515397
M335,429,23172136561717475448330683293080199.1999,317190,5291,920.9123 × 3 × 52 × 149 × 563 × 1129 × 99317 × 190529
M200,679,9313710355350205898477648774.979,931714,5699,530.897 × 1861 × 9931 × 714569
M140,140,3872172364259111424316816174.209,92935,521478.7124 × 5 × 41 × 67 × 9929 × 35521
M332,352,46779597442781115598505743548460999.3399,223176,0511,772.4125 × 467 × 1733 × 2647 × 99223 × 176051
M167,997,3116634140676076095888588775.819,90172,229952.7317 × 109 × 149 × 9901 × 72229
M194,054,1835513278568716497310768775.559,901921,07312,192.3237 × 421 × 9901 × 921073
M347,169,76187044601978867161074169385789.499,88350,085,319559,663.2524 × 3 × 19 × 2777 × 9883 × 50085319
M20,884,2474042770110947460897284175.109831,10914.7722 × 5 × 72 × 17 × 137 × 389 × 983 × 1109
M88,580,6838516239334248931848548176.179831,22916.1322 × 34 × 5 × 23 × 59 × 181 × 983 × 1229
M97,900,973873172741314132729625772.899832,01727.6727 × 199 × 883 × 983 × 2017
M209,579,7794266889520384157894705775.18983182,1312,422.7423 × 32 × 53 × 149 × 983 × 182131
M690,009,941914632054107011815654351982.9298368,103,959,447821,326,558.5432 × 11 × 983 × 68103959447
M332,320,06160605637764883200943991979.009,829424,9035,378.263 × 7 × 37 × 281 × 9829 × 424903
M93,731,039561699884819623192940556182.229772,46730.0122 × 32 × 5 × 72 × 67 × 109 × 193 × 977 × 2467
M101,788,76953217262532676317727168778.829773,08339.123 × 37 × 43 × 349 × 521 × 977 × 3083
M185,668,6696077636688427334184319375.6997,463289,7333,828.1022 × 32 × 7 × 23 × 97463 × 289733
M80,751,877571763081768000641521772.289711,93126.7223 × 3 × 13 × 73 × 829 × 971 × 1931
M134,924,5932747311276947306739435174.549714,60361.7552 × 41 × 71 × 313 × 971 × 4603
M179,951,5914099263369367438398967375.129711,43919.1622 × 34 × 47 × 53 × 101 × 971 × 1439
M332,259,013572963264829793553361888182.249716,82983.0325 × 3 × 5 × 11 × 383 × 643 × 971 × 6829
M2,487,49376220428212709177759.40971913.2225 × 7 × 19 × 29 × 67 × 97 × 191
M184,296,4513905618594824032002371175.05978,365,229111,465.095 × 72 × 13 × 41 × 97 × 8365229
M179,979,0498613181800393244515495176.199,69775,479990.6832 × 52 × 1453 × 9697 × 75479
M222,889,2916263712423402036631138375.73967,3612,848,09137,608.773 × 17 × 967361 × 2848091
M46,850,29191601441118976371588169.639671,05115.0922 × 33 × 5 × 47 × 379 × 967 × 1051
M123,390,2471059683228428840014764973.179673,04141.5625 × 7 × 19 × 47 × 73 × 967 × 3041
M131,294,2491831547662698613122806373.969679,319126.017 × 41 × 149 × 181 × 967 × 9319
M168,432,6833669434452742600653696174.9696730,841411.4427 × 5 × 13 × 439 × 967 × 30841
M321,797,123183598398036895594998676180.60967147,502,800,2091,829,995,352.8922 × 5 × 967 × 147502800209
M138,335,9291313299273610248048480173.489,62921,031286.2325 × 52 × 293 × 9629 × 21031
M203,693,0033837248999106255562468775.029,62967,723902.7013 × 41 × 271 × 9629 × 67723
M37,181,9535493579210612373472233775.5496196112.7224 × 7 × 19 × 312 × 67 × 79 × 139 × 491
M89,586,43910013204510068678609236176.4196196112.5822 × 3 × 5 × 7 × 13 × 312 × 47 × 67 × 149 × 227
M94,744,453481081963174649453887372.0396196113.3422 × 35 × 72 × 312 × 41 × 83 × 163
M139,999,60943936489729510775047653778.5496196112.2422 × 3 × 13 × 312 × 97 × 223 × 673 × 719
M151,576,7711912190469575379252802374.0296196112.9836 × 7 × 312 × 109 × 197 × 599
M194,513,9276085519862095232327389775.699,60134,228,949452,238.6722 × 7 × 17 × 9601 × 34228949
M203,580,4494908125459841990896128175.389,54783,5971,109.0429 × 5 × 59 × 9547 × 83597
M22,954,29724165817765194960543167.719531,00914.903 × 5 × 13 × 67 × 419 × 953 × 1009
M28,991,9692656802602561671796048174.499531,19316.0224 × 5 × 109 × 113 × 409 × 953 × 1193
M41,940,791339924326044942596014371.539531,03914.5311 × 13 × 29 × 71 × 139 × 953 × 1039
M58,562,821820235258712303576426772782.769532,31127.9272 × 41 × 53 × 523 × 571 × 953 × 2311
M105,333,9196339669953878112374737775.759532,38931.5423 × 3 × 232 × 29 × 359 × 953 × 2389
M134,868,7331205669170400997588537773.3595397113.2425 × 32 × 367 × 457 × 953 × 971
M210,454,2599055309343141661902975976.26953225,747,357,6772,960,186,974.74953 × 225747357677
M600,000,88910765401528120351378612508986.489,52119,309223.2924 × 32 × 11 × 239 × 1289 × 9521 × 19309
M147,378,6171735667602707877029063173.889,51120,047271.3532 × 5 × 6863 × 9511 × 20047

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