121 271 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
146495369	9	27.1	old
13941303877717725602187461873829512286354071036635649	53	173.2	2014-12-17 14:20:29

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	1322 / 4588

Estimated T-Level: 36.4 ⓘ

TF below 2^116 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-22	Oliver Kruse	D49B4C387BA8B578	2	0	1	3
Verified	2017-10-09	Chang Chia-Tche	D49B4C387BA8B578	2	0	1	3
Verified	2017-10-13	kkmrkkblmbrbk	D49B4C387BA8B578	2	97755	1	3
Verified	2020-04-17	Oliver Kruse	69EB1886ACF0503C	2	75278	5	3
Verified	2023-01-20	Dobri	69EB1886ACF0503C	2	117747	5	3

P-1 factors

Date	Factor	B1	B2
2014-12-17	13941303877717725602187461873829512286354071036635649	10000000	100000000

History

Date	User	Type	Result
2023-01-20	WeakForceBoson	CERT	PRP Certification Proof certified good
2023-01-20	Dobri	C-PRP	M121271/146495369/13941303877717725602187461873829512286354071036635649 : 69EB1886ACF0503C PRP proof power = 5 PRP: Verified Proof certified good
2022-04-03	Dobri	NF	no factor from 2^59 to 2^60
2022-04-03	Dobri	NF	no factor from 2^58 to 2^59
2022-04-03	Dobri	NF	no factor from 2^57 to 2^58
2022-04-03	Dobri	F	Factor: 146495369 / TF: 1-57
2020-04-17	Oliver Kruse	C-PRP	M121271/146495369/13941303877717725602187461873829512286354071036635649 : 69EB1886ACF0503C PRP: Verified PRP without proof (small exponent)
2017-10-13	kkmrkkblmbrbk	C-PRP	M121271/146495369/13941303877717725602187461873829512286354071036635649 : D49B4C387BA8B578 PRP: Verified PRP without proof (not generated)
2017-10-09	Chang Chia-Tche	C-PRP	M121271/known_factors : D49B4C387BA8B578 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M121271/146495369/13941303877717725602187461873829512286354071036635649 : D49B4C387BA8B578 PRP without proof (not generated)
2017-03-10	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=2000000000, E=12
2014-12-17	BloodIce	F-PM1	Factor: 13941303877717725602187461873829512286354071036635649