1 231 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Details

Composite, with 4 known prime factors. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
531793	6	19.0	old
5684759	7	22.4	old
18207494497	11	34.1	old
63919078363121681207	20	65.8	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	16550 / 16550
55	110000000	40830 / 40830
60	260000000	105362 / 105362
65	800000000	84572 / 194238

Estimated T-Level: 62.2 ⓘ

TF below 2^202 is very unlikely to find new factors due to ECM effort.

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	No proof (small exponent)	2017-09-27	Oliver Kruse	68D0F782048F612D	4	0	1	3
Verified	No proof (small exponent)	2017-10-09	Chang Chia-Tche	68D0F782048F612D	4	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	68D0F782048F612D	4	1041	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	FC65CB04915B75A4	4	669	5	3
Verified	No proof (small exponent)	2020-08-12	_p95holder_	FC65CB04915B75A4	4	128	5	3

History

Date	User	Type	Result
2025-09-06	ViliamF	NF-PP1	Start=6/5, B1=50000000000, B2=5000000000000
2025-09-04	ViliamF	NF-PP1	Start=2/7, B1=50000000000, B2=5000000000000
2024-05-17	Joe S.	NF-PM1	B1=1300000000000, B2=1.3007928645315E+19
2021-07-19	ViliamF	NF-PP1	Start=2/7, B1=1000000000, B2=221000000000
2021-03-27	nordi	NF-PM1	B1=1000000000000, B2=2232843418649129478
2020-08-12	_p95holder_	C-PRP	M1231/531793/5684759/18207494497/63919078363121681207 : FC65CB04915B75A4
2020-04-17	Oliver Kruse	C-PRP	M1231/531793/5684759/18207494497/63919078363121681207 : FC65CB04915B75A4
2017-10-12	kkmrkkblmbrbk	C-PRP	M1231/531793/5684759/18207494497/63919078363121681207 : 68D0F782048F612D
2017-10-09	Chang Chia-Tche	C-PRP	M1231/known_factors : 68D0F782048F612D
2017-09-27	Oliver Kruse	C-PRP	M1231/531793/5684759/18207494497/63919078363121681207 : 68D0F782048F612D
2017-09-25	csaba	C-PRP	M1231/known_factors : 68D0F782048F612D
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=1000000000, B2=100000000000, E=12
2015-12-09	yatyatling	F-ECM	Factor: 3023115042887
2011-02-05	-anonymous-	F-PM1	Factor: 3518320234436123508989746786859512241376673
2011-02-05	-anonymous-	F	Factor: 55043350507162971492839
2009-10-25	Carsten Kossendey	F	Factor: 55043350507162971492839
2005-01-20	-anonymous-	F	Factor: 55043350507162971492839