1 388 659 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
25262484529	11	34.6	old
10725924351097	14	43.3	2008-07-15 09:59:00
157185236737951997209	21	67.1	2015-01-19 11:24:58
348250303198755524849	21	68.2	2018-08-09 15:06:28
401697676255545113761	21	68.4	2015-01-19 11:24:58

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 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)	2017-10-05	Oliver Kruse	1250AE90CF3D05C5	4	0	1	3
Verified (Factored)	2017-10-25	Chang Chia-Tche	1250AE90CF3D05C5	4	463744	1	3
Verified	2018-08-09	ATH	C3518CDB4824DB14	5	1142587	5	3
Verified	2018-08-12	Oliver Kruse	C3518CDB4824DB14	5	1295599	5	3

P-1 factors

Date	Factor	B1	B2
2015-01-19	157185236737951997209	500000	15000000
2015-01-19	401697676255545113761	500000	15000000

History

Date	User	Type	Result
2018-08-12	Oliver Kruse	C-PRP	M1388659/25262484529/10725924351097/157185236737951997209/401697676255545113761/348250303198755524849 : C3518CDB4824DB14 PRP: Verified PRP without proof (not generated)
2018-08-09	ATH	C-PRP	M1388659/25262484529/10725924351097/157185236737951997209/401697676255545113761/348250303198755524849 : C3518CDB4824DB14 PRP: Verified PRP without proof (not generated)
2018-08-09	Chang Chia-Tche	F-ECM	Factor: 348250303198755524849 / (ECM curve 2, B1=50000, B2=5000000)
2017-10-25	Chang Chia-Tche	C-PRP	M1388659/25262484529/10725924351097/157185236737951997209/401697676255545113761 : 1250AE90CF3D05C5 PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1388659/25262484529/10725924351097/157185236737951997209/401697676255545113761 : 1250AE90CF3D05C5 PRP: Verified PRP without proof (not generated)
2017-09-30	Oliver Kruse	C-PRP	M1388659/25262484529/10725924351097/157185236737951997209/401697676255545113761 : 1250AE90CF3D05C5 PRP without proof (not generated)
2015-01-19	alpertron	F-PM1	Factor: 63140944339313057482163445956931059493049 / (P-1, B1=500000, B2=15000000, E=12)
2008-07-15	J Feitsma	F	Factor: 10725924351097