1 866 211 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
134367193	9	27.0	old
13858482887	11	33.7	2008-07-15 07:47:35
307331359903	12	38.2	2008-07-15 07:47:35
4019393588667457879009	22	71.8	2020-10-12 13:09:34

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-04	Oliver Kruse	58DAEB97538AEC93	3	0	1	3
Verified (Factored)	2017-11-07	Chang Chia-Tche	58DAEB97538AEC93	3	1703120	1	3
Verified	2020-10-12	mrh	F6D76C550FB68FE7	4	1830483	5	3

History

Date	User	Type	Result
2020-10-12	Albrecht Heeffer	CERT	PRP Certification Proof certified good
2020-10-12	mrh	C-PRP	M1866211/134367193/13858482887/307331359903/4019393588667457879009 : F6D76C550FB68FE7 PRP proof power = 7 PRP: Verified Proof certified good
2020-10-12	nordi	F-ECM	Factor: 4019393588667457879009 / (ECM curve 3, B1=50000, B2=5000000, Sigma=2579762622005065)
2017-11-07	Chang Chia-Tche	C-PRP	M1866211/134367193/13858482887/307331359903 : 58DAEB97538AEC93 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1866211/134367193/13858482887/307331359903 : 58DAEB97538AEC93 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2008-07-15	J Feitsma	F	Factor: 307331359903
2008-07-15	J Feitsma	F	Factor: 13858482887