3 861 863 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 2⁶⁴

Factored

Factor	Digits	Bits	Date
278054137	9	28.1	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	76547F9F92A475B4	1	0	1	3
Verified	PRP without proof (not generated)	2017-12-22	storm5510	76547F9F92A475B4	1	460725	1	3

History

Date	User	Type	Result
2022-05-18	Joss	NF-PM1	B1=100000, B2=130364850
2022-03-22	Joss	NF-PM1	B1=100000
2022-03-03	Joss	NF-PM1	B1=90000
2017-12-22	storm5510	C-PRP	M3861863/278054137 : 76547F9F92A475B4
2017-09-20	kkmrkkblmbrbk	C-PRP	M3861863/278054137 : 76547F9F92A475B4

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