3 861 881 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 2⁶⁴

Factored

Factor	Digits	Bits	Date
278055433	9	28.1	old
6171285839	10	32.5	2008-09-07 21:12:43

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	21F543D4EEDE4765	2	0	1	3
Verified	PRP without proof (not generated)	2017-12-22	storm5510	21F543D4EEDE4765	2	1438284	1	3

History

Date	User	Type	Result
2022-05-24	Joss	NF-PM1	B1=100000, B2=130364850
2022-03-22	Joss	NF-PM1	B1=100000
2022-03-05	Joss	NF-PM1	B1=90000
2017-12-22	storm5510	C-PRP	M3861881/278055433/6171285839 : 21F543D4EEDE4765
2017-09-20	kkmrkkblmbrbk	C-PRP	M3861881/278055433/6171285839 : 21F543D4EEDE4765
2008-09-07	Will Edgington	F	Factor: 6171285839

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