10 987 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 3 known prime factors. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
197767	6	17.6	old
1955739723753776762466229965124230239	37	120.6	2012-12-04 01:17:14
989861062672134212459231177531894143473649	42	139.5	2025-08-06 05:41:02

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	2420 / 16550

Estimated T-Level: 45.7 ⓘ

TF below 2^147 is very unlikely to find new factors due to ECM effort.

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Factored	No proof (small exponent)	2017-09-21	Oliver Kruse	726ABF16134273D4	2	0	1	3
Factored	No proof (small exponent)	2017-10-02	kkmrkkblmbrbk	726ABF16134273D4	2	0	1	3
Factored	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	726ABF16134273D4	2	8078	1	3
Factored	No proof (small exponent)	2020-04-17	Oliver Kruse	3B0EC8D5DE001194	2	10065	5	3
Factored	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	3B0EC8D5DE001194	2	7295	5	3
Verified	No proof (small exponent)	2025-08-06	nordi	3B0EC8D5DE001194	3	600	5	3

History

Date	User	Type	Result
2025-08-06	nordi	C-PRP	M10987/197767/1955739723753776762466229965124230239/989861062672134212459231177531894143473649 : 3B0EC8D5DE001194
2025-08-06	nordi	F-ECM	Factor: 989861062672134212459231177531894143473649 / ECM curve 526, B1=44000000, B2=1117403522235, Edwards Sigma=6264231697607566
2025-02-22	masser	NF-PP1	Start=102/71, B1=640000000, B2=639360000000
2025-02-14	masser	NF-PP1	Start=6/5, B1=640000000, B2=639360000000
2025-01-26	masser	NF-PP1	Start=2/7, B1=640000000, B2=639360000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M10987/1955739723753776762466229965124230239/197767 : 3B0EC8D5DE001194
2022-12-29	-anonymous-	NF-PM1	B1=100000000000, B2=122192573512709700
2020-04-17	Oliver Kruse	C-PRP	M10987/197767/1955739723753776762466229965124230239 : 3B0EC8D5DE001194
2017-10-12	kkmrkkblmbrbk	C-PRP	M10987/197767/1955739723753776762466229965124230239 : 726ABF16134273D4
2017-10-02	kkmrkkblmbrbk	C-PRP	M10987/197767/1955739723753776762466229965124230239 : 726ABF16134273D4
2017-09-21	Oliver Kruse	C-PRP	M10987/197767/1955739723753776762466229965124230239 : 726ABF16134273D4
2017-09-21	Oliver Kruse	C-PRP	M10987/197767/1955739723753776762466229965124230239 : 726ABF16134273D4
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12
2012-12-04	SRJ2877	F-ECM	Factor: 1955739723753776762466229965124230239