1 889 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
62178021761	11	35.9	old
305847916137939752397216527569009633	36	117.9	old
25718835523458856192039411849171149938229285957161	50	164.1	2019-10-29 01:14:45
33758375023360330868641591258894605015270410464979782920239	59	194.4	2019-11-02 19:32:08

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	84798 / 194238

Estimated T-Level: 62.2 ⓘ

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

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-09-21	Oliver Kruse	CABE913E32328EDB	2	0	1	3
Verified (Factored)	2017-10-02	kkmrkkblmbrbk	CABE913E32328EDB	2	0	1	3
Verified (Factored)	2017-12-07	ATH	CABE913E32328EDB	2	1735	1	3
Verified (Factored)	2019-10-29	Niels_Mache_Nextcloud	3D7B37284999A4FF	3	1043	5	3
Verified (Factored)	2019-10-29	ATH	3D7B37284999A4FF	3	380	5	3
Verified	2019-11-02	mnd9	3D7B37284999A4FF	4	265	5	3
Verified	2020-04-17	Oliver Kruse	3D7B37284999A4FF	4	1590	5	3

History

Date	User	Type	Result
2022-12-08	mikr	NF-PM1	B1=400000000000, B2=2574610952249956620
2021-07-25	ViliamF	NF-PP1	Start=2/7, B1=1000000000, B2=221000000000
2020-04-17	Oliver Kruse	C-PRP	M1889/62178021761/305847916137939752397216527569009633/25718835523458856192039411849171149938229285957161/33758375023360330868641591258894605015270410464979782920239 : 3D7B37284999A4FF PRP: Verified PRP without proof (small exponent)
2019-11-02	mnd9	C-PRP	M1889/62178021761/305847916137939752397216527569009633/25718835523458856192039411849171149938229285957161/33758375023360330868641591258894605015270410464979782920239 : 3D7B37284999A4FF PRP: Verified PRP without proof (small exponent)
2019-11-02	Ryan Propper	F-ECM	Factor: 33758375023360330868641591258894605015270410464979782920239 / (ECM curve 1, B1=260000000)
2019-10-29	ATH	C-PRP	M1889/62178021761/305847916137939752397216527569009633/25718835523458856192039411849171149938229285957161 : 3D7B37284999A4FF PRP: Verified PRP without proof (small exponent)
2019-10-29	Niels_Mache_Nextcloud	C-PRP	M1889/62178021761/305847916137939752397216527569009633/25718835523458856192039411849171149938229285957161 : 3D7B37284999A4FF PRP: Verified PRP without proof (small exponent)
2019-10-29	Ryan Propper	F-ECM	Factor: 25718835523458856192039411849171149938229285957161 / (ECM curve 1, B1=110000000)
2017-12-07	ATH	C-PRP	M1889/62178021761/305847916137939752397216527569009633 : CABE913E32328EDB PRP: Verified PRP without proof (small exponent)
2017-10-02	kkmrkkblmbrbk	C-PRP	M1889/62178021761/305847916137939752397216527569009633 : CABE913E32328EDB PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M1889/known_factors : CABE913E32328EDB PRP without proof (not generated)
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=1000000000, B2=100000000000, E=12