2 615 827 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
723250007231	12	39.4	old
858089476938034009177	21	69.5	2019-03-05 19:00:30

ECM

Digits	B1	Curves
25	50000	78 / 280

Estimated T-Level: 21.4 ⓘ

TF below 2^66 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-17	Oliver Kruse	9B7C37B6B62BCD9D	1	1175448	5	3
Verified (Factored)	2017-12-02	kkmrkkblmbrbk	9B7C37B6B62BCD9D	1	2315682	5	3
Verified	2019-03-05	ATH	9B7C37B6B62BCD9D	2	1149562	5	3
Verified	2019-03-15	alex	9B7C37B6B62BCD9D	2	782410	5	3

P-1 factors

Date	Factor	B1	B2
2019-03-05	858089476938034009177	2000000	0

History

Date	User	Type	Result
2022-09-02	USAFSS	NF-PM1	B1=360000, B2=288177120
2021-07-18	ATH	NF-PP1	Start=2/7, B1=1000000, B2=100000000
2019-03-15	alex	C-PRP	M2615827/723250007231/858089476938034009177 : 9B7C37B6B62BCD9D PRP: Verified PRP without proof (not generated)
2019-03-05	ATH	C-PRP	M2615827/723250007231/858089476938034009177 : 9B7C37B6B62BCD9D PRP: Verified PRP without proof (not generated)
2019-03-05	alpertron	F-PM1	Factor: 858089476938034009177 / (P-1, B1=2000000)
2017-12-02	kkmrkkblmbrbk	C-PRP	M2615827/723250007231 : 9B7C37B6B62BCD9D PRP: Verified PRP without proof (not generated)
2017-10-17	Oliver Kruse	C-PRP	M2615827/723250007231 : 9B7C37B6B62BCD9D PRP: Verified PRP without proof (not generated)