6 991 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
15150796780703	14	43.8	old
102346503435601	15	46.5	old
3263565159955914039377	22	71.5	old
152998361330856023375188758505898921942830471	45	146.8	old

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	D52F522D894F3169	4	0	1	3
Verified	2017-10-02	kkmrkkblmbrbk	D52F522D894F3169	4	0	1	3
Verified	2017-12-07	ATH	D52F522D894F3169	4	2586	1	3
Verified	2020-04-17	Oliver Kruse	5607D88B2B032467	4	1350	5	3
Verified	2024-02-03	Wentao Huang	5607D88B2B032467	4	5050	5	3

History

Date	User	Type	Result
2024-02-03	Wentao Huang	C-PRP	M6991/15150796780703/102346503435601/3263565159955914039377/152998361330856023375188758505898921942830471 : 5607D88B2B032467 PRP: Verified PRP without proof (small exponent)
2023-08-20	-Anonymous-	NF-PM1	B1=35000000000, B2=143589103727719650
2021-12-16	Lisander Viaene	NF-PM1	B1=100000000
2020-04-17	Oliver Kruse	C-PRP	M6991/15150796780703/102346503435601/3263565159955914039377/152998361330856023375188758505898921942830471 : 5607D88B2B032467 PRP: Verified PRP without proof (small exponent)
2017-12-07	ATH	C-PRP	M6991/15150796780703/102346503435601/3263565159955914039377/152998361330856023375188758505898921942830471 : D52F522D894F3169 PRP: Verified PRP without proof (small exponent)
2017-10-02	kkmrkkblmbrbk	C-PRP	M6991/15150796780703/102346503435601/3263565159955914039377/152998361330856023375188758505898921942830471 : D52F522D894F3169 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M6991/known_factors : D52F522D894F3169 PRP without proof (not generated)