2+(4k)

2^1276+1

Open composite · C287

NFS Planning

GNFS Murphy estimate: 5.04e-20
SNFS Murphy score: 7.39e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.96148

Identifiers

Target expression: 2^1276+1
Target link: FactorDB page
Target ID: 1000000000012151300
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C287
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(4,44,116) 91873.5758764536429511022083665050905453386595210401. C287

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 7.39e-18
Skew: 0.96148
Selected: Best

n: 28602688927518685869798228843065769756098757294677979876692438573916445525330486756794147918531000000644122040010538668674872960962317061344984021835364711459875999738823297630169357525059273256367701933325666304033625616363990785666050459456829138988881005035714539944131827932949512337
# 2^1276+1, difficulty: 384.11, skewness: 1.22
# cost: 6.36786e+22, est. time: 30323144.40 GHz days (not accurate yet!)
# Optimized skew: 0.96148 Murphy: 7.39e-18
skew: 0.96148
c7: 1
c0: 4
Y1: -6129982163463555433433388108601236734474956488734408704
Y0: 1
type: snfs