2+(odd)

2^1321+1

Open composite · C387

NFS Planning

GNFS Murphy estimate: 7.99e-26
SNFS Murphy score: 2.49e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.54995

Identifiers

Target expression: 2^1321+1
Target link: FactorDB page
Target ID: 1000000000012151345
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C387
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 102725010187. C387

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 2.49e-18
Skew: 1.54995
Selected: Best

n: 148534324124907207155443647315995890645600262103570138661505268045105179935557632143904870392225083222897784714162497600913813101920785454781786350324454908394679360285648031352397032152825933351972246609912251212844937077282161574713739983312137034193964391107234193841815251132311705585408906071690195163917903467628919031868014191023851744237889578495931406393851329480271929584450273
# 2^1321+1, difficulty: 398.26, skewness: 1.22
# cost: 1.45402e+23, est. time: 69238818.15 GHz days (not accurate yet!)
# Optimized skew: 1.54995 Murphy: 2.49e-18
skew: 1.54995
c7: 1
c0: 4
Y1: -1
Y0: 784637716923335095479473677900958302012794430558004314112
type: snfs