Mersenne numbers with smoothest P-1 factors:
Top 2,509 factors (top 100 per 10M range) listed here
Exponent Factor Bits min B1 min B2 ↓Ratio k (factored)
M158,005,73923816279621599474243611177.6622,51199,7611,284.653 × 5 × 13 × 1721 × 22511 × 99761
M228,501,1079358102657891489815203976.3149995,239,36713,042,290.4172 × 13 × 17 × 19 × 995239367
M193,131,7079524384498601786746047376.3342,409994,91313,033.6722 × 3 × 487 × 42409 × 994913
M221,983,2414762537109016051764656975.3327993,263,401,90313,184,769,758.6822 × 33 × 993263401903
M350,250,03731093075913557653153736778.0412199,144,449,8671,270,415,892.85112 × 37 × 99144449867
M163,547,7074453384721978640502437775.2455,81999,1031,317.2122 × 3 × 7 × 293 × 55819 × 99103
M22,996,83716484898918297506788967.1660199114.7623 × 32 × 19 × 53 × 83 × 601 × 991
M28,135,56764799074844048882532169.1340199114.3322 × 3 × 5 × 13 × 97 × 383 × 401 × 991
M52,433,6393478720921623212282820174.8876199113.2322 × 32 × 52 × 11 × 157 × 283 × 761 × 991
M191,651,3115883814054752107917543975.643,5599,883130.663 × 7 × 71 × 2927 × 3559 × 9883
M141,801,5877202569228266964927947175.931,1539,871130.003 × 5 × 11 × 13 × 101 × 103 × 1153 × 9871
M211,023,6534931843440544783411703175.387998,612,007,2231,308,119,682.953 × 5 × 79 × 98612007223
M205,725,3535113575264743620509904775.44390,889984,35313,048.7217 × 19 × 390889 × 984353
M50,916,743140776381727512818687170.2564398313.9932 × 5 × 43 × 89 × 127 × 643 × 983
M71,007,8231590558391286609898160173.7528198313.3324 × 52 × 72 × 137 × 151 × 281 × 983
M76,435,9013057029397103541864155800184.6654198311.6123 × 3 × 53 × 11 × 23 × 47 × 83 × 127 × 541 × 983
M213,584,2978032941322845189422311176.095,2339,805,067128,864.245 × 733 × 5233 × 9805067
M167,832,2774014243645647850415043375.095,2979,791130.3924 × 31 × 4649 × 5297 × 9791
M163,895,3396431017319347056186112175.773,54197,7111,289.6228 × 5 × 443 × 3541 × 97711
M20,756,23758269653364163250566368.9894797714.163 × 7 × 19 × 47 × 809 × 947 × 977
M28,868,561196624300703450018124170.7450997713.8122 × 3 × 5 × 11 × 19 × 43 × 127 × 509 × 977
M31,942,2894569989439909320175205775.2770997712.9822 × 11 × 13 × 19 × 167 × 569 × 709 × 977
M33,271,4111765564149359672871951173.9085397713.223 × 5 × 72 × 31 × 89 × 157 × 853 × 977
M41,037,0193050259882456833689563174.6935997713.0832 × 5 × 43 × 47 × 61 × 191 × 359 × 977
M179,928,23913480369836188240883290376.845,6899,756,569126,980.4517 × 397 × 5689 × 9756569
M210,194,1135701940292611386383429775.5916,74197,5531,290.4922 × 33 × 769 × 16741 × 97553
M20,676,03714933526341912060995167.0272797114.4952 × 7 × 23 × 31 × 41 × 727 × 971
M36,072,7099880596559532471896006376.3963197112.7132 × 19 × 61 × 421 × 509 × 631 × 971
M44,437,573437735573489945013931171.8970197113.515 × 107 × 211 × 641 × 701 × 971
M49,951,789476187253904834580060172.0145797113.4822 × 34 × 52 × 89 × 149 × 457 × 971
M66,973,7571495010909384410343577773.6633797113.1828 × 3 × 13 × 127 × 269 × 337 × 971
M101,303,8193210236478870535936537774.7729397112.9927 × 109 × 179 × 223 × 293 × 971
M134,868,7331205669170400997588537773.3595397113.2425 × 32 × 367 × 457 × 953 × 971
M139,941,5771442898067035462446200173.6157197113.1923 × 53 × 11 × 79 × 107 × 571 × 971
M176,184,7317514412187198787764660175.99163970,48112,770.8222 × 52 × 13 × 17 × 61 × 163 × 970481
M186,215,7593648245366850128745032974.9519,43396,938,0811,293,376.5422 × 13 × 19433 × 96938081
M48,569,329136715514314009201968970.2152396713.7722 × 3 × 13 × 19 × 41 × 229 × 523 × 967
M77,939,699910079064723876087611372.9542196713.2623 × 7 × 53 × 211 × 229 × 421 × 967
M212,480,6634264928997007094781475375.176796,614,8391,285,200.0824 × 3 × 17 × 19 × 67 × 96614839
M179,924,87310087516257240909371304176.427,8739,649126.2723 × 3 × 5 × 7 × 23 × 191 × 7873 × 9649
M867,000,083961414077040220771436238382.9969,427963,34911,607.8132 × 61 × 151 × 69427 × 963349
M210,625,5434810504670955505806211175.35139,5899,624,529127,733.345 × 17 × 139589 × 9624529
M204,507,8697736947750296082193665776.03127,453961,24112,642.2223 × 193 × 127453 × 961241
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
M168,802,3494064900645958884785089775.111,9979,601127.8323 × 3 × 233 × 1123 × 1997 × 9601
M152,963,0331753014040662206504219973.891,49995,3931,290.977 × 19 × 23 × 131 × 1499 × 95393

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