2 157 209 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
17257673	8	24.0	old
2296438649051183953	19	61.0	2016-03-22 12:18:39
413335382309406615857	21	68.5	2016-03-29 11:23:23

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	160 / 640

Estimated T-Level: 26.3 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-08	Oliver Kruse	9ED71402D86FE006	1	0	1	3
Verified	2017-10-18	Oliver Kruse	08B9848EFA1AE901	3	1509225	5	3
Verified	2017-11-18	kkmrkkblmbrbk	08B9848EFA1AE901	3	1020634	5	3

P-1 factors

Date	Factor	B1	B2
2016-03-29	413335382309406615857	500000	15000000

History

Date	User	Type	Result
2017-11-18	kkmrkkblmbrbk	C-PRP	M2157209/17257673/2296438649051183953/413335382309406615857 : 08B9848EFA1AE901 PRP: Verified PRP without proof (not generated)
2017-10-18	Oliver Kruse	C-PRP	M2157209/17257673/2296438649051183953/413335382309406615857 : 08B9848EFA1AE901 PRP: Verified PRP without proof (not generated)
2017-10-08	Oliver Kruse	C-PRP	M2157209/17257673/2296438649051183953/413335382309406615857 : 9ED71402D86FE006 PRP: Verified PRP without proof (not generated)
2016-03-29	alpertron	F-PM1	Factor: 949199346955668367691672756876913742721 / (P-1, B1=500000, B2=15000000, E=12)
2016-03-22	TJAOI	F	Factor: 2296438649051183953 / TF: 60-61