2 608 631 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 3 known prime factors. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁶³

Factored

Factor	Digits	Bits	Date
5217263	7	22.3	old
155396148671	12	37.2	2008-07-14 20:25:21
141738901063553	15	47.0	2014-02-25 12:21:08

ECM

Digits	B1	Curves
25	50000	186 / 280

Estimated T-Level: 23.3 ⓘ

TF below 2^72 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	D8743C02262C1D30	3	2235258	5	3
Verified	PRP without proof (not generated)	2017-12-02	storm5510	D8743C02262C1D30	3	1244624	5	3

History

Date	User	Type	Result
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-12-02	storm5510	C-PRP	M2608631/5217263/155396148671/141738901063553 : D8743C02262C1D30
2017-10-15	Oliver Kruse	C-PRP	M2608631/5217263/155396148671/141738901063553 : D8743C02262C1D30
2014-02-25	TJAOI	F	Factor: 141738901063553
2008-07-14	George Woltman	F-ECM	Factor: 155396148671

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