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 statusMnStatusDetails139267987Composite: proven not-prime with PRP test TFNo factors below 277TF target 277 P-1B1 = 1181000B2 = 1263916170 PRPStatusDateUserResidueShiftTypeBaseVerified2025-09-23Santtu Rekilä43A1756F9BC088DF7188571913 HistoryDateUserTypeResult2025-09-23qprimeCERTPRP CertificationCERT proof power = 8Proof certified good2025-09-23Santtu RekiläC-PRP43A1756F9BC088DFPRP proof power = 8PRP: VerifiedProof certified good2024-09-22Luke DurantNF-PM1B1=1181000, B2=12639161702024-08-12Luke DurantNFno factor from 2^76 to 2^772024-07-14SRBaseNFno factor from 2^75 to 2^762023-01-16SRBaseNFno factor from 2^74 to 2^752021-08-03SRBaseNFno factor from 2^73 to 2^742020-10-23SRBaseNFno factor from 2^72 to 2^732016-02-24Mihai PredaNFno factor from 2^71 to 2^722016-02-24Mihai PredaNFno factor from 2^70 to 2^712016-02-24Mihai PredaNFno factor from 2^69 to 2^702016-02-24Mihai PredaNFno factor from 2^68 to 2^692016-02-24Mihai PredaNFno factor from 2^67 to 2^682015-02-09nikoszNFno factor from 2^66 to 2^672012-11-22Le ComteNFno factor from 2^65 to 2^662010-12-06Mr-PlonkNFno factor from 2^64 to 2^652010-06-13Nathan EdingtonNFno factor from 2^63 to 2^64