2+(odd)

2^1357+1

Open composite · C275

NFS Planning

GNFS Murphy estimate: 2.50e-19
SNFS Murphy score: 1.11e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.40689

Identifiers

Target expression: 2^1357+1
Target link: FactorDB page
Target ID: 1000000000012151381
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C275
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,23,59) 781633.18316787.41383073.24110014570655700403.39545919851678025221192750465371.34963123856135244678143953310498486257.C275

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 1.11e-18
Skew: 1.40689
Selected: Best

n: 98805557320698676469532616732434087411539825000181100169070522317519665736924386934868361910770315375163342050200831930677156187243333107523736561045866412794955877356150921180018040318499203128319302009206971720233115285003140073491324499405231003188101687292961142228766273
# 2^1357+1, difficulty: 408.80, skewness: 1.10
# cost: 2.65851e+23, est. time: 126595743.78 GHz days (not accurate yet!)
# Optimized skew: 1.40689 Murphy: 1.11e-18
skew: 1.40689
c7: 1
c0: 2
Y1: -1
Y0: 25108406941546723055343157692830665664409421777856138051584
type: snfs