15 616 001 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
441137173376105636207	21	68.6	2016-12-24 05:35:54

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)	2002-08-31	Nestor Abad	09014275978FF870	14041286
Verified (Factored)	2006-01-15	Art Dardia	09014275978FF870	11879128

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2023-08-22	Perig	9693CC6EE382725D	1	5054523	5	3

History

Date	User	Type	Result
2023-08-23	FineMojon	CERT	PRP Certification Proof certified good
2023-08-22	Perig	C-PRP	M15616001/441137173376105636207 : 9693CC6EE382725D PRP proof power = 8 PRP: Verified Proof certified good
2023-07-27	nordi	NF-PM1	B1=480000, B2=308477400
2023-07-17	nordi	NF-PM1	B1=480000
2016-12-24	Sergey Nosov	F-ECM	Factor: 441137173376105636207 / (ECM curve 1, B1=50000, B2=5000000)
2013-12-31	Nesowa	NF	no factor from 2^66 to 2^67
2013-09-15	David Campeau	NF	no factor from 2^65 to 2^66