2^1277-1

Open composite · C385

NFS Planning

GNFS Murphy estimate: 1.04e-25
SNFS Murphy score: 7.13e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.06162

Identifiers

Target expression: 2^1277-1
Target link: FactorDB page
Target ID: 1000000000000001277
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C385
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

C385

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 7.13e-18
Skew: 1.06162
Selected: Best

n: 2601983048666099770481310081841021384653815561816676201329778087600902014918340074503059860433081046210605403488570251947845891562080866227034976651419330190731032377347305086443295837415395887618239855136922452802923419286887119716740625346109565072933087221327790207134604146257063901166556207972729700461767055550785130256674608872183239507219512717434046725178680177638925792182271
# 2^1277-1, difficulty: 384.42, skewness: 1.35
# cost: 6.48194e+22, est. time: 30866369.93 GHz days (not accurate yet!)
# Optimized skew: 1.06162 Murphy: 7.13e-18
skew: 1.06162
c7: 1
c0: -8
Y1: -6129982163463555433433388108601236734474956488734408704
Y0: 1
type: snfs