81 350 537 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁵

TF target 2⁷⁵

P-1

B1 =	690000
B2 =	13972500

Status	Date	User	Residue	Shift	Software
Verified	2017-09-17	patgie	514EACA3C3E0D03A	53000249	Windows 64-bit,Prime95,v26,(aka We4)
Verified	2025-03-19	-anonymous-	514EACA3C3E0D03A	31135009	Windows 64-bit,Prime95,v29.4,build 8

History

Date	User	Type	Result
2025-03-19	-anonymous-	C-LL	514EACA3C3E0D03A
2017-09-17	patgie	C-LL	514EACA3C3E0D03A
2017-06-14	bam	NF-PM1	B1=690000, B2=13972500, E=12
2016-11-06	-anonymous-	NF	no factor TF: 74-75
2016-11-06	-anonymous-	NF	no factor TF: 73-74
2016-09-20	Judge Hale	NF	no factor TF: 72-73
2016-09-20	Judge Hale	NF	no factor TF: 71-72
2013-11-08	Robish	NF	no factor TF: 70-71
2013-11-08	-anonymous-	NF	no factor TF: 70-71
2013-01-31	SMoffat	NF	no factor TF: 69-70
2013-01-30	rjbelans	NF	no factor TF: 68-69
2011-02-23	Tim Hatton	NF	no factor TF: 67-68
2011-02-21	Sunshine	NF	no factor TF: 66-67
2011-02-18	-anonymous-	NF	no factor TF: 65-66
2010-12-13	Architects Cubed	NF	no factor TF: 64-65