15 939 757 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
353617588796476156169	21	68.3	2018-03-25 22:17:29

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

TF below 2^61 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2002-08-03	Pat Lett	C3FFBDC5504FAE9D	13058165
Verified (Factored)	2006-03-28	LASZLO	C3FFBDC5504FAE9D	495597

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2023-11-29	Perig	BFA27EA266D0F8B9	1	7324076	5	3

History

Date	User	Type	Result
2025-02-16	James Heinrich	F	Factor: 353617588796476156169 / TF: 68-69
2023-11-29	Cosmos95	CERT	PRP Certification Proof certified good
2023-11-29	Perig	C-PRP	M15939757/353617588796476156169 : BFA27EA266D0F8B9 PRP proof power = 8 PRP: Verified Proof certified good
2023-10-30	nordi	NF-PM1	B1=480000, B2=264402600
2023-09-08	nordi	NF-PM1	B1=480000
2018-03-25	ramgeis	F	Factor: 353617588796476156169 / TF: 68-69*
2018-03-25	ramgeis	NF	no factor from 2^67 to 2^68
2016-03-16	Mark Rose	NF	no factor from 2^65 to 2^66
2014-07-29	Nesowa	NF	no factor from 2^66 to 2^67