12 253 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
1212966745149912607	19	60.1	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1252 / 9201

Estimated T-Level: 40.7 ⓘ

TF below 2^130 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-21	Oliver Kruse	A31F48934A1D0CBF	1	0	1	3
Verified	2017-10-12	kkmrkkblmbrbk	A31F48934A1D0CBF	1	6101	1	3
Unverified	2020-04-17	Oliver Kruse	57FF64CE040821__	1	2454	5	3

History

Date	User	Type	Result
2023-04-06	-Anonymous-	NF-PM1	B1=100000000000, B2=120447384588771240
2020-04-17	Oliver Kruse	C-PRP	M12253/1212966745149912607 : 57FF64CE040821__ PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M12253/1212966745149912607 : A31F48934A1D0CBF PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M12253/1212966745149912607 : A31F48934A1D0CBF PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M12253/1212966745149912607 : A31F48934A1D0CBF PRP without proof (not generated)
2016-09-09	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12