2+(4k)

2^1420+1

Open composite · C333

NFS Planning

GNFS Murphy estimate: 1.08e-22
SNFS Murphy score: 6.20e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.09206

Identifiers

Target expression: 2^1420+1
Target link: FactorDB page
Target ID: 1000000000012151444
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C333
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(4,20,284) 17041. C333

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 6.20e-17
Skew: 1.09206
Selected: Best

n: 888031950945049343552337898901732131354442802939411513088966721692540587255252773792202075178325741332069468074236229978350723702462355093315758477034933030587813815592868985041848396884413788200925810253752185899333823036282461595726557210001691933642935162961088669476144632633635028350947551158384049102808924188117041095812556161
# 2^1420+1, difficulty: 341.97, skewness: 1.00
# cost: 4.85576e+21, est. time: 2312266.21 GHz days (not accurate yet!)
# Optimized skew: 1.09206 Murphy: 6.20e-17
skew: 1.09206
c8: 1
c6: -1
c4: 1
c2: -1
c0: 1
Y1: -1
Y0: 5575186299632655785383929568162090376495104
type: snfs