15 139 591 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
895133127988042299852961	24	79.6	2022-10-26 02:24:04

ECM

Digits	B1	Curves
25	50000	6 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2002-11-02	Brandon Harris	9FE4011A2329C3D5	64717
Verified (Factored)	2005-09-22	TheJudger	9FE4011A2329C3D5	8636937

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2023-06-21	XZT	F545D3F18146E596	1	2352962	5	3

History

Date	User	Type	Result
2023-11-04	nordi	NF-PM1	B1=480000, B2=454342350
2023-10-22	nordi	NF-PM1	B1=480000
2023-06-21	Chad Steenerson	CERT	PRP Certification Proof certified good
2023-06-21	XZT	C-PRP	M15139591/895133127988042299852961 : F545D3F18146E596 PRP proof power = 8 PRP: Verified Proof certified good
2022-10-26	ATH	F-PP1	Start=6/5, B1=1000000, Factor: 895133127988042299852961
2021-10-15	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-02	SRBase	NF	no factor from 2^70 to 2^71
2021-08-09	ATH	NF-PP1	Start=2/7, B1=200000, B2=7600000
2021-06-30	lycorn	NF	no factor from 2^69 to 2^70
2017-12-24	ramgeis	NF	no factor from 2^68 to 2^69
2017-12-24	ramgeis	NF	no factor from 2^67 to 2^68
2014-05-14	Nesowa	NF	no factor from 2^66 to 2^67
2014-05-14	Nesowa	NF	no factor from 2^65 to 2^66