2+(odd)

2^1231+1

Open composite · C358

NFS Planning

GNFS Murphy estimate: 3.84e-24
SNFS Murphy score: 2.05e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.39615

Identifiers

Target expression: 2^1231+1
Target link: FactorDB page
Target ID: 1000000000012151255
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C358
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 5680156935617. C358

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 2.05e-17
Skew: 1.39615
Selected: Best

n: 2169916752602060088646663054473510219101132016895904576896471875942209297846969676042174867931601763790825091883783328019569918934060448934302934042846147008457730562129572136985045456666995612528625967356305085614855886646132067941210038899510354754244452749940840119758923674573938279805217858620965431700320307673013148023698940303704281419006180106011499
# 2^1231+1, difficulty: 370.87, skewness: 1.10
# cost: 2.89086e+22, est. time: 13765999.90 GHz days (not accurate yet!)
# Optimized skew: 1.39615 Murphy: 2.05e-17
skew: 1.39615
c7: 1
c0: 2
Y1: -1
Y0: 95780971304118053647396689196894323976171195136475136
type: snfs