15 362 471 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

TF

No factors below 2⁷⁴

TF target 2⁶⁹

P-1

B1 =	1400000
B2 =	721766760

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2002-08-31	Robin Tremblay	00E261636167DA76	965638
Verified	2005-10-18	Hirzo Merenga	00E261636167DA76	13602214

History

Date	User	Type	Result
2024-09-02	Sid & Andy	NF-PM1	B1=1400000, B2=721766760
2022-02-26	-Anonymous-	NF	no factor from 2^73 to 2^74
2022-02-26	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-10-09	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-07	SRBase	NF	no factor from 2^70 to 2^71
2021-06-18	lycorn	NF	no factor from 2^69 to 2^70
2021-01-23	Tha	NF-PM1	B1=1200000, B2=85200000
2018-03-03	ramgeis	NF	no factor from 2^68 to 2^69
2018-03-03	ramgeis	NF	no factor from 2^67 to 2^68
2014-04-21	Nesowa	NF	no factor from 2^66 to 2^67
2014-04-21	Nesowa	NF	no factor from 2^65 to 2^66