Exponent Range: to+ above minimum exponent Output results in HTML format Output results in text-only format Output results in plain-text format Show full details (current assignment, history, LL residues) Include full ECM history (every "NF-ECM" result, slow) Include ancient history logs (1997-2007, slow) Include expired assignments Show software version in historyGet statusMnStatusDetails154333591Composite: 1 known prime factor FactoredFactorDigitsBitsDate125666887396731647885714857756204687937119.92025-05-20 21:49:39 P-1 factorsDateFactorB1B22025-05-20125666887396731647885714857756204687990000086361198 HistoryDateUserTypeResult2025-05-20Ryan PropperF-PM1Factor: 1256668873967316478857148577562046879 / (P-1, B1=900000, B2=86361198)2024-12-14Jonathon NguyenNFno factor from 2^76 to 2^772024-08-13SRBaseNFno factor from 2^75 to 2^762023-02-16SRBaseNFno factor from 2^74 to 2^752021-11-14SRBaseNFno factor from 2^73 to 2^742017-10-14David HruskaNFno factor from 2^72 to 2^732017-09-08David HruskaNFno factor from 2^71 to 2^722017-08-08David HruskaNFno factor from 2^70 to 2^712017-07-09La GüiraNFno factor from 2^69 to 2^702017-03-02XolotlNFno factor from 2^68 to 2^692016-05-03tscNFno factor from 2^67 to 2^682015-04-07guruNFno factor from 2^66 to 2^672013-01-30CorbyguyNFno factor from 2^65 to 2^662011-02-01RichardNFno factor from 2^64 to 2^652010-06-25Torchwood InstituteNFno factor from 2^63 to 2^64