1 912 387 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 3 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
45897289	8	25.5	old
55887842473537	14	45.7	2014-01-24 11:47:20
1655870639326574489209	22	70.5	2020-12-01 18:28:15

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-04	Oliver Kruse	F92596CFD12F58C6	2	0	1	3
Verified (Factored)	2017-11-09	ATH	F92596CFD12F58C6	2	990711	1	3
Verified	2020-12-02	Poao	21C30F7178999F0F	3	209196	5	3

History

Date	User	Type	Result
2021-07-04	Dylan Delgado	NF-PM1	B1=2000000, B2=262000000
2021-04-07	Dylan Delgado	NF-PM1	B1=1000000, B2=71000000
2020-12-02	Jorge Coveiro	CERT	PRP Certification Proof certified good
2020-12-02	Poao	C-PRP	M1912387/45897289/55887842473537/1655870639326574489209 : 21C30F7178999F0F PRP proof power = 7 PRP: Verified Proof certified good
2020-12-01	_p95holder_	F-ECM	Factor: 1655870639326574489209 / (ECM curve 1, B1=50000, B2=5000000)
2017-11-09	ATH	C-PRP	M1912387/45897289/55887842473537 : F92596CFD12F58C6 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1912387/45897289/55887842473537 : F92596CFD12F58C6 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2014-01-24	TJAOI	F	Factor: 55887842473537