266 381 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
903564353	9	29.8	old
1303259119807751	16	50.2	2014-05-22 17:39:41
138309590080662461592113	24	76.9	2015-02-27 10:12:39
211904504721734610288510328313	30	97.4	2021-06-30 04:26:46

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	500 / 640

Estimated T-Level: 28.9 ⓘ

TF below 2^91 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-09-22	Oliver Kruse	86A5DA63A9F74BED	3	0	1	3
Verified (Factored)	2017-10-12	kkmrkkblmbrbk	86A5DA63A9F74BED	3	143277	1	3
Verified (Factored)	2020-04-17	Oliver Kruse	D6B8F4FC78979C8B	3	116423	5	3
Verified	2021-06-30	Randy Rowell	D6B8F4FC78979C8B	4	245065	5	3

History

Date	User	Type	Result
2021-06-30	Ben Delo	CERT	PRP Certification Proof certified good
2021-06-30	Randy Rowell	C-PRP	M266381/903564353/1303259119807751/138309590080662461592113/211904504721734610288510328313 : D6B8F4FC78979C8B PRP proof power = 5 PRP: Verified Proof certified good
2021-06-30	George Woltman	F-PP1	Start=2/7, B1=10000000, B2=830000000, Factor: 211904504721734610288510328313
2021-06-30	George Woltman	NF-PM1	B1=20000000, B2=1820000000
2020-04-17	Oliver Kruse	C-PRP	M266381/903564353/1303259119807751/138309590080662461592113 : D6B8F4FC78979C8B PRP: Verified (Factored) PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M266381/903564353/1303259119807751/138309590080662461592113 : 86A5DA63A9F74BED PRP: Verified (Factored) PRP without proof (small exponent)
2017-09-22	Oliver Kruse	C-PRP	M266381/known_factors : 86A5DA63A9F74BED PRP without proof (not generated)
2015-02-27	TJAOI	F-ECM	Factor: 138309590080662461592113 / (ECM curve 19, B1=50000, B2=5000000)
2014-05-22	TJAOI	F	Factor: 1303259119807751