1 973 927 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
15791417	8	23.9	old
39370578697552498871	20	65.1	2018-05-30 12:29:55

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	58 / 640

Estimated T-Level: 25.5 ⓘ

TF below 2^80 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	FEBBA49FABA06EDA	1	0	1	3
Verified (Factored)	2017-11-12	kkmrkkblmbrbk	FEBBA49FABA06EDA	1	1573848	1	3
Verified	2018-06-01	_p95holder_	7EB5C377C7EADEAA	2	978012	5	3
Verified	2018-06-01	ATH	7EB5C377C7EADEAA	2	556389	5	3

History

Date	User	Type	Result
2022-08-12	USAFSS	NF-PM1	B1=192000, B2=211179150
2018-06-01	ATH	C-PRP	M1973927/15791417/39370578697552498871 : 7EB5C377C7EADEAA PRP: Verified PRP without proof (not generated)
2018-06-01	_p95holder_	C-PRP	M1973927/15791417/39370578697552498871 : 7EB5C377C7EADEAA PRP: Verified PRP without proof (not generated)
2018-05-30	TJAOI	F	Factor: 39370578697552498871 / TF: 65-66
2017-11-12	kkmrkkblmbrbk	C-PRP	M1973927/15791417 : FEBBA49FABA06EDA PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1973927/15791417 : FEBBA49FABA06EDA PRP: Verified PRP without proof (not generated)