4 850 987 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁶⁵

Factored

Factor	Digits	Bits	Date
689034193481	12	39.3	old

ECM

Digits	B1	Curves
25	50000	3 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 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)	2017-09-20	kkmrkkblmbrbk	1EB69F21D35471D7	1	0	1	3
Verified	PRP without proof (not generated)	2018-04-29	storm5510	1EB69F21D35471D7	1	2198339	1	3

History

Date	User	Type	Result
2023-12-01	USAFSS	NF-PM1	B1=256000, B2=105522060
2018-04-29	storm5510	C-PRP	M4850987/689034193481 : 1EB69F21D35471D7
2017-09-20	kkmrkkblmbrbk	C-PRP	M4850987/689034193481 : 1EB69F21D35471D7

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