2+(odd)

2^1213+1

Open composite · C282

NFS Planning

GNFS Murphy estimate: 9.83e-20
SNFS Murphy score: 3.11e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.96529

Identifiers

Target expression: 2^1213+1
Target link: FactorDB page
Target ID: 1000000000012151237
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C282
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 1809697712203883.4827522415574830043.3777892251034479160417.4927122961739010211937166971.C282

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 3.11e-17
Skew: 0.96529
Selected: Best

n: 289128019489566585277980046414738952576853884517368947971571230503833643410337814626640418265557777499396423251748346319136329182390270541506442045769532359180928893666415730148663437918299944625046776420535217861803086593652194710437310640594287801724468446168356935520963841962857
# 2^1213+1, difficulty: 365.15, skewness: 1.22
# cost: 2.04479e+22, est. time: 9737102.06 GHz days (not accurate yet!)
# Optimized skew: 0.96529 Murphy: 3.11e-17
skew: 0.96529
c7: 1
c0: 4
Y1: -11972621413014756705924586149611790497021399392059392
Y0: 1
type: snfs