15 104 783 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 2⁷³

TF target 2⁶⁹

P-1

B1 =	1500000
B2 =	4336061730

ECM

Digits	B1	Curves
25	50000	14 / 280

Estimated T-Level: 20.3 ⓘ

Status	Date	User	Residue	Shift
Verified	2002-09-29	Northwestern College	FD43CC179CF3C926	4489308
Verified	2005-11-27	Sylvester Ziolkowski	FD43CC179CF3C926	7739199

History

Date	User	Type	Result
2023-07-15	Sid & Andy	NF	no factor from 2^72 to 2^73
2022-03-10	Luminescence	NF-PM1	B1=1500000, B2=4336061730
2022-02-21	ATH	NF-PP1	Start=2/7, B1=1000000, B2=29000000
2021-10-15	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-06	SRBase	NF	no factor from 2^70 to 2^71
2021-06-27	lycorn	NF	no factor from 2^69 to 2^70
2017-10-08	ramgeis	NF	no factor from 2^68 to 2^69
2016-11-09	mikr	NF	no factor from 2^67 to 2^68
2016-08-16	Tha	NF-PM1	B1=300000, B2=6000000, E=12
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