17 256 787 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
43608471359327145160471	23	75.2	2017-12-27 21:21:27

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

TF below 2^61 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2003-01-16	Ryan Malayter	EC9CF26AC87D0A81	16162647
Verified (Factored)	2006-05-29	Marc Getty	EC9CF26AC87D0A81	11815723

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-10-03	riccardo uberti	792B7D94A2BC7BC7	1	14959537	5	3
Verified	2020-08-08	Jaytholomew	792B7D94A2BC7BC7	1	12675841	5	3

History

Date	User	Type	Result
2020-08-08	Jaytholomew	C-PRP	M17256787/43608471359327145160471 : 792B7D94A2BC7BC7 PRP: Verified PRP without proof (not generated)
2019-10-03	riccardo uberti	C-PRP	M17256787/43608471359327145160471 : 792B7D94A2BC7BC7 PRP: Verified PRP without proof (not generated)
2017-12-27	Sid & Andy	F-ECM	Factor: 43608471359327145160471 / (ECM curve 1, B1=50000, B2=5000000)
2017-06-12	riccardo uberti	NF-PM1	B1=430000, B2=9000000, E=12
2014-09-05	Nesowa	NF	no factor from 2^66 to 2^67
2013-09-23	David Campeau	NF	no factor from 2^65 to 2^66