1 373 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 5 known prime factors. Cofactor is PRP (Probable-Prime).

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
1957392737	10	30.9	old
4540035943	10	32.1	old
95805718487	11	36.5	old
416034935039	12	38.6	old
142203959478768454375479374259330640346359070988407	51	166.6	2011-12-13 19:36:06

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Factored	No proof (small exponent)	2017-11-16	kkmrkkblmbrbk	PRP_PRP_PRP_PRP_	5	619	1	3

History

Date	User	Type	Result
2017-11-16	kkmrkkblmbrbk	P-PRP	M1373/1957392737/4540035943/95805718487/416034935039/142203959478768454375479374259330640346359070988407 PRP Cofactor
2011-12-13	Michael Kenn	F-ECM	Factor: 142203959478768454375479374259330640346359070988407
2009-10-25	Carsten Kossendey	F	Factor: 354208106470006206747110315194493708684063