2+(odd)

2^1373+1

Open composite · C375

NFS Planning

GNFS Murphy estimate: 3.97e-25
SNFS Murphy score: 7.83e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.86570

Identifiers

Target expression: 2^1373+1
Target link: FactorDB page
Target ID: 1000000000012151397
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C375
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 810098767097.542204060920476295985452379. C375

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 7.83e-19
Skew: 0.86570
Selected: Best

n: 156445132253929872141217665069669773658756921548042523934199616205804346340177315213919128233481166702819037098276294406031016517981191359850442686900568074834101968362876995719699413100265674645285158168939026387138830868433461764558749474884293808390398619313146313834622110600561083754934163591724119904640675413306856339059858843168498752060096619700025583390285709521337
# 2^1373+1, difficulty: 413.31, skewness: 1.10
# cost: 3.43327e+23, est. time: 163489189.19 GHz days (not accurate yet!)
# Optimized skew: 0.86570 Murphy: 7.83e-19
skew: 0.86570
c7: 1
c0: 2
Y1: -100433627766186892221372630771322662657637687111424552206336
Y0: 1
type: snfs