2 558 909 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁶³

Factored

Factor	Digits	Bits	Date
97238543	8	26.5	old
28649523628221857	17	54.7	2014-12-07 13:47:34

ECM

Digits	B1	Curves
25	50000	128 / 280

Estimated T-Level: 22.3 ⓘ

TF below 2^69 is very unlikely to find new factors due to ECM effort.

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-15	Oliver Kruse	C272562C30E6E411	2	485124	5	3
Verified	PRP without proof (not generated)	2017-12-01	storm5510	C272562C30E6E411	2	1313299	5	3

History

Date	User	Type	Result
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-12-01	storm5510	C-PRP	M2558909/97238543/28649523628221857 : C272562C30E6E411
2017-10-15	Oliver Kruse	C-PRP	M2558909/97238543/28649523628221857 : C272562C30E6E411
2014-12-07	TJAOI	F	Factor: 28649523628221857

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