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 statusMnStatusDetails139983919Composite: proven not-prime with PRP test TFNo factors below 277TF target 277 P-1B1 = 1221000B2 = 1771924770 PRPStatusDateUserResidueShiftTypeBaseVerified2025-09-03S00030E2F93421577E46A2013 HistoryDateUserTypeResult2025-09-04lou_chengkaiCERTPRP CertificationCERT proof power = 9Proof certified good2025-09-03S00030C-PRPE2F93421577E46A2PRP proof power = 9PRP: VerifiedProof certified good2024-09-24Luke DurantNF-PM1B1=1221000, B2=17719247702024-07-15Luke DurantNFno factor from 2^76 to 2^772024-07-11Luke DurantNFno factor from 2^75 to 2^762024-07-10Joe S.NFno factor from 2^69 to 2^702024-07-10Joe S.NFno factor from 2^68 to 2^692023-01-18SRBaseNFno factor from 2^74 to 2^752021-09-11Neutron3529NFno factor from 2^73 to 2^742021-09-07LordJuliusNFno factor from 2^1 to 2^632020-10-25SRBaseNFno factor from 2^72 to 2^732016-09-26Johan ViljoenNFno factor from 2^71 to 2^722016-09-05Smok_bmv NFno factor from 2^70 to 2^712016-08-31DerekNFno factor from 2^69 to 2^702016-08-31DerekNFno factor from 2^68 to 2^692016-08-17Judge HaleNFno factor from 2^67 to 2^682015-02-12Karol TNFno factor from 2^66 to 2^672012-11-28RichardNFno factor from 2^65 to 2^662010-12-08abcNFno factor from 2^64 to 2^652010-06-14Charles A. MorrisNFno factor from 2^63 to 2^64