2^1331-1

Open composite · C250

NFS Planning

GNFS Murphy estimate: 7.06e-18
SNFS Murphy score: 2.09e-18
Preferred method: GNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.86783

Identifiers

Target expression: 2^1331-1
Target link: FactorDB page
Target ID: 1000000000000001331
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C250
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(11,121) 2663.80497247099660420588857.69474230349847530551244234511.131437248032743119455503505737464640742780068008121338081647.C250

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 2.09e-18
Skew: 0.86783
Selected: Best

n: 9007418824227016642379209854318643094991067964480637691689015784756227643366169947317659199260091690766589377612448178864927109040812364271103804378391242381517870756259513616232168140500396952573647707141695904838309239883626851653719329497264228751
# 2^1331-1, difficulty: 400.67, skewness: 1.10
# cost: 1.67046e+23, est. time: 79545557.97 GHz days (not accurate yet!)
# Optimized skew: 0.86783 Murphy: 2.09e-18
skew: 0.86783
c7: 1
c0: -2
Y1: -1569275433846670190958947355801916604025588861116008628224
Y0: 1
type: snfs