2+(odd)

2^1241+1

Open composite · C279

NFS Planning

GNFS Murphy estimate: 1.47e-19
SNFS Murphy score: 3.79e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.24522

Identifiers

Target expression: 2^1241+1
Target link: FactorDB page
Target ID: 1000000000012151265
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C279
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,17,73) 69497.7353977369.200409698947654675332283.1587270753424607766885764505731.C279

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 3.79e-17
Skew: 1.24522
Selected: Best

n: 564397204601051499208030660627082008254110639843022445378631659041721171217215679576177658178598429789309920752336809107471225077082221650368599567871308677210604270695126994666081198866825279706483759116620653327316849501469477119633021162290953196497916481838760423230090965379
# 2^1241+1, difficulty: 351.60, skewness: 1.00
# cost: 8.88677e+21, est. time: 4231796.61 GHz days (not accurate yet!)
# Optimized skew: 1.24522 Murphy: 3.79e-17
skew: 1.24522
c8: 1
c7: -1
c6: -7
c5: 6
c4: 15
c3: -10
c2: -10
c1: 4
c0: 1
Y1: -9444732965739290427392
Y0: 89202980794122492566142873090593446023921665
type: snfs