1 913 651 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
520513073	9	29.0	old
1554879710521	13	40.5	2008-07-15 07:48:09
6240206796655346429617	22	72.4	2021-03-21 01:38:13

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 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)	2017-09-30	alpertron	2A183F09C4001ECB	2	0	1	3
Verified (Factored)	2017-10-20	Oliver Kruse	2A183F09C4001ECB	2	210913	1	3
Verified	2021-03-24	volki	69075FBFC4A0BF72	3	415989	5	3

History

Date	User	Type	Result
2021-07-11	Dylan Delgado	NF-PM1	B1=2000000, B2=262000000
2021-04-07	Dylan Delgado	NF-PM1	B1=1000000, B2=71000000
2021-03-24	curtisc	CERT	PRP Certification Proof certified good
2021-03-24	volki	C-PRP	M1913651/520513073/1554879710521/6240206796655346429617 : 69075FBFC4A0BF72 PRP proof power = 7 PRP: Verified Proof certified good
2021-03-21	MarkS	F-ECM	Factor: 6240206796655346429617 / (ECM curve 4, B1=50000, B2=5000000, Sigma=3219031263324635)
2017-10-20	Oliver Kruse	C-PRP	M1913651/520513073/1554879710521 : 2A183F09C4001ECB PRP: Verified (Factored) PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1913651/1554879710521/520513073 : 2A183F09C4001ECB PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2008-07-15	J Feitsma	F	Factor: 1554879710521