19 753 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

TF

No factors below 2⁶⁶

TF target 2⁴⁴

TF below 2^161 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	1000000000000
B2 =	1402034650733706990

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	16187 / 16550

Estimated T-Level: 49.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	57A1	0
Verified		George Woltman	AC83F2BBE1C0D7A1	0
Verified		Brian J. Beesley	AC83F2BBE1C0D7A1	0
Verified	2015-04-11	MadPoo	AC83F2BBE1C0D7A1	16230

History

Date	User	Type	Result
2024-09-25	-Anonymous-	NF-PM1	B1=1000000000000, B2=1402034650733706990
2023-08-29	masser	NF-PP1	Start=6/5, B1=380000000, B2=68020000000
2023-07-08	masser	NF-PP1	Start=82/47, B1=380000000, B2=15200000000
2022-05-31	-Anonymous-	NF-PM1	B1=100000000000, B2=80107051974399450
2022-05-02	Ruslan Borisov	NF	no factor from 2^65 to 2^66
2021-12-21	-Anonymous-	NF-PM1	B1=40000000000, B2=10078242275050950
2021-05-08	ATH	NF-PP1	Start=2/7, B1=500000000, B2=105500000000
2021-02-24	Ruslan Borisov	NF	no factor from 2^64 to 2^65
2018-10-01	James Hintz	NF-PM1	B1=33444564033, B2=2541786866508, E=12
2018-03-23	snme2pm1	NF	no factor from 2^63 to 2^64
2016-04-03	Sid & Andy	NF	no factor from 2^62 to 2^63
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2016-02-23	LaurV	NF	no factor from 2^58 to 2^59
2016-02-23	LaurV	NF	no factor from 2^59 to 2^60
2015-04-11	MadPoo	C-LL	AC83F2BBE1C0D7A1
2015-03-12	snme2pm1	NF	no factor from 2^61 to 2^62
2013-01-16	bcp19	NF-PM1	B1=10000000000, B2=100000000000, E=12
2012-12-25	bcp19	NF	no factor from 2^60 to 2^61
2010-03-17	GrunwalderGIMP	NF	no factor from 2^1 to 2^60