2+(4k)

2^1208+1

Open composite · C330

NFS Planning

GNFS Murphy estimate: 1.62e-22
SNFS Murphy score: 3.21e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.69924

Identifiers

Target expression: 2^1208+1
Target link: FactorDB page
Target ID: 1000000000012151232
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C330
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(8) 53058511043237064262021661839681. C330

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 3.21e-17
Skew: 1.69924
Selected: Best

n: 323255989371255531027372528021915688492433050220268347574816957420861735123870934983495910907182175066776543226978193321752653505933164893925938097142188523730257308409817518291854142688339622605430607594066481781092306808837114608533257411815474518707941417264695085708868893999485679022973444298566119590485072267830465366326721
# 2^1208+1, difficulty: 364.55, skewness: 1.35
# cost: 1.97123e+22, est. time: 9386814.49 GHz days (not accurate yet!)
# Optimized skew: 1.69924 Murphy: 3.21e-17
skew: 1.69924
c7: 1
c0: 8
Y1: -1
Y0: 11972621413014756705924586149611790497021399392059392
type: snfs