18 245 597 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
1396262556023	13	40.3	old
255609574682249	15	47.9	2008-09-08 14:28:03

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2025-09-16	Adel El-Atawy	8AF3D5F696A7C6CC	2	3733546	5	3

History

Date	User	Type	Result
2025-09-16	irgendwer	CERT	PRP Certification Proof certified good
2025-09-16	Adel El-Atawy	C-PRP	M18245597/1396262556023/255609574682249 : 8AF3D5F696A7C6CC PRP proof power = 8 PRP: Verified Proof certified good
2008-09-08	Will Edgington	F	Factor: 255609574682249

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