12 239 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
288373592888473	15	48.0	old
248344365828022895426978263	27	87.7	2008-08-29 02:24:29

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1282 / 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	6C2A4C0529A64195	2	0	1	3
Verified	2017-10-02	kkmrkkblmbrbk	6C2A4C0529A64195	2	0	1	3
Verified	2017-12-07	ATH	6C2A4C0529A64195	2	12190	1	3
Verified	2020-04-17	Oliver Kruse	6168112C5E3396EB	2	4994	5	3
Verified	2024-07-01	kkmrkkblmbrbk	6168112C5E3396EB	2	3345	5	3

P-1 factors

Date	Factor	B1	B2
2023-04-06	248344365828022895426978263	100000000000	121982729876067056

History

Date	User	Type	Result
2024-07-01	kkmrkkblmbrbk	C-PRP	M12239/248344365828022895426978263/288373592888473 : 6168112C5E3396EB PRP: Verified PRP without proof (small exponent)
2023-04-06	-Anonymous-	F-PM1	Factor: 248344365828022895426978263 / (P-1, B1=100000000000, B2=121982729876067060)
2020-04-17	Oliver Kruse	C-PRP	M12239/288373592888473/248344365828022895426978263 : 6168112C5E3396EB PRP: Verified PRP without proof (small exponent)
2017-12-07	ATH	C-PRP	M12239/288373592888473/248344365828022895426978263 : 6C2A4C0529A64195 PRP: Verified PRP without proof (small exponent)
2017-10-02	kkmrkkblmbrbk	C-PRP	M12239/288373592888473/248344365828022895426978263 : 6C2A4C0529A64195 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M12239/288373592888473/248344365828022895426978263 : 6C2A4C0529A64195 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M12239/288373592888473/248344365828022895426978263 : 6C2A4C0529A64195 PRP without proof (not generated)
2016-09-09	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12
2008-08-29	-Anonymous-	F-ECM	Factor: 248344365828022895426978263