1 855 697 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
138232323858295871	18	56.9	old
48107172024300135660113	23	75.3	2021-06-08 03:40:42

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 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	AA0D30028684CF57	1	0	1	3
Verified (Factored)	2017-11-07	kkmrkkblmbrbk	AA0D30028684CF57	1	673381	1	3
Verified	2021-06-08	mrh	15631DA9A0857F43	2	1037561	5	3

History

Date	User	Type	Result
2021-06-08	GIMPS-PRIM	CERT	PRP Certification Proof certified good
2021-06-08	mrh	C-PRP	M1855697/138232323858295871/48107172024300135660113 : 15631DA9A0857F43 PRP proof power = 7 PRP: Verified Proof certified good
2021-06-08	Chang Chia-Tche	F-ECM	Factor: 48107172024300135660113 / (ECM curve 4, B1=50000, B2=5000000, Sigma=2556717137268035)
2017-11-07	kkmrkkblmbrbk	C-PRP	M1855697/138232323858295871 : AA0D30028684CF57 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1855697/138232323858295871 : AA0D30028684CF57 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12