13 020 883 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
155895712951235095529	21	67.1	2017-01-28 12:18:28

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)	2001-11-24	Lawrence Ng	0594863FAC92C1C6	1501924
Verified (Factored)	2005-02-18	Brandon Harris	0594863FAC92C1C6	3636578

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2022-06-01	Poao	4DF79946B148030E	1	766693	5	3

History

Date	User	Type	Result
2023-10-28	nordi	NF-PM1	B1=500000, B2=338934750
2023-10-16	nordi	NF-PM1	B1=500000
2022-06-01	mikeblas	CERT	PRP Certification Proof certified good
2022-06-01	Poao	C-PRP	M13020883/155895712951235095529 : 4DF79946B148030E PRP proof power = 8 PRP: Verified Proof certified good
2017-01-28	Conductor	F	Factor: 155895712951235095529 / TF: 67-68
2015-05-20	mikr	NF	no factor from 2^66 to 2^67
2014-05-19	Nesowa	NF	no factor from 2^65 to 2^66
2013-05-29	lycorn	NF	no factor from 2^64 to 2^65
2012-04-08	James Heinrich	NF-PM1	B1=255000, B2=6566250, E=12