13 159 477 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
1918671297968571641951	22	70.7	2016-06-03 09:42:45

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)	2002-01-02	Rick Robinson	7EBC8521D2EC898D	1806050
Verified (Factored)	2005-05-12	Fabrice Bellet	7EBC8521D2EC898D	2711898

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2022-06-14	Poao	148937EB48C57911	1	9743340	5	3

History

Date	User	Type	Result
2023-10-29	nordi	NF-PM1	B1=500000, B2=315199500
2023-10-21	nordi	NF-PM1	B1=500000
2022-06-14	Hang	CERT	PRP Certification Proof certified good
2022-06-14	Poao	C-PRP	M13159477/1918671297968571641951 : 148937EB48C57911 PRP proof power = 8 PRP: Verified Proof certified good
2016-06-03	bam	F-ECM	Factor: 1918671297968571641951 / (ECM curve 1, B1=50000, B2=5000000)
2015-07-12	Nesowa	NF	no factor from 2^66 to 2^67
2014-05-26	Nesowa	NF	no factor from 2^65 to 2^66
2013-05-21	lycorn	NF	no factor from 2^64 to 2^65