72 215 551 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 2⁷⁴

P-1

B1 =	830000
B2 =	22617500

Status	Date	User	Residue	Shift	Software
Verified	2015-12-06	arnaud	5D2F2F3FFC01158E	26402597	Windows 64-bit,Prime95,v28.5,build 2
Verified	2024-06-04	God_is_Evil	5D2F2F3FFC01158E	47386897	Windows 64-bit,Prime95,v30.19,build 13

History

Date	User	Type	Result
2024-06-04	God_is_Evil	C-LL	5D2F2F3FFC01158E
2015-12-06	arnaud	C-LL	5D2F2F3FFC01158E
2015-08-16	Syntony	NF-PM1	B1=830000, B2=22617500, E=6
2015-07-05	RichD0	NF	no factor TF: 74-75
2015-07-04	James Heinrich	NF	no factor TF: 72-74
2015-02-10	RichD0	NF	no factor TF: 71-72
2013-04-19	frmar	NF	no factor TF: 70-71
2012-11-28	pal1	NF	no factor TF: 69-70
2010-09-23	eon_blue_apocalypse	NF	no factor TF: 68-69
2010-09-22	charger	NF	no factor TF: 67-68
2010-09-18	charger	NF	no factor TF: 66-67
2010-07-12	tmorrow	NF	no factor TF: 65-66
2010-07-10	tmorrow	NF	no factor TF: 64-65
2008-09-19	Wojciech Florek	NF	no factor TF: 1-64