M6 915 871 Mersenne number exponent details

≡

is 2 ^6915871 - 1

has 2081885 decimal digits

takes 1.508 GHz-days to do one PRP test

Last-known PrimeNet details:

Exponent is not assigned to anyone

0 primality tests remaining

	Residue	Status
L-L	-unknown-	-unknown-
PRP	-unknown-	-unknown-

	Trial Factoring			P-1 Factoring				Combined
	Limit	GHz-days	Probability	B1	B2	GHz-days	Probability	GHz-days	Probability
Actual	2⁶⁷	4.2965	65.6716%	-	-	-	-	4.2965	65.6716%
Target	2⁶⁷	4.2965	65.6716%	45000	900000	0.0290	2.2361%	4.3254	66.4392%
Difference	-	-	-	-45000	-900000	-0.0290	-2.2361%	-0.0290	-0.7676%

Known prime factors (1 factor, 34.6 bits, 0.00049987% known):

Remaining cofactor is not a probable-prime

						P-1		GHz-days
exponent	factor	digits	bits*	k	date found	min B1	min B2	min. TF	min. P-1	normal P-1
6915871	25505732249	11	34.570	1844 2² × 461	-	4	461	4.630e-10	9.137e-6	1.482e-5

P-1 results:
No P-1 results for M6915871

Trial Factoring results:
No TF results for M6915871

ECM factoring results:
No ECM results for M6915871

Lucas-Lehmer results:
No L-L results for M6915871

PRP results:

date

userid

compid

cofactors

res64

PRP

2018-01-19

trebor

Desktop

25505732249

2D76AC1457AD28__

no

2019-01-22

ATH

ec2-PRPCFDC1

25505732249

2D76AC1457AD2849

no

P-1 factor-bounds graph:

X = B1; Y = B2
size of marker relates to size of factor
mouse-over any factor marker (circle) to see additional info
mouse-over any stage bound text to see additional info

10⁰

10¹

10⁰

10¹

10²

10³

TF factor-bounds graph:

this exponent TF target: 67

TF double-checked to: 67.8

2⁵⁰

2⁶⁰

2⁷⁰

Last modified: 2023-04-26T21:34:10+00:00