2+(4k)

2^1376+1

Open composite · C349

NFS Planning

GNFS Murphy estimate: 1.28e-23
SNFS Murphy score: 6.63e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.71669

Identifiers

Target expression: 2^1376+1
Target link: FactorDB page
Target ID: 1000000000012151400
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C349
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(32) 3412481.70632833.22988345528310529.30449592423592235219030401.C349

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 6.63e-19
Skew: 1.71669
Selected: Best

n: 2275873424592090131643303273881924900622575857719409131161963740651963469177885724425548426881493979426987034999515148300948464822823872803928959130501146803407551369545035013727942822912440971796663271747609626266058268193451018707305100970448048615067620691537989265350709364644379353074416732688464801005614495121142728470059625561204372471053313
# 2^1376+1, difficulty: 415.12, skewness: 1.35
# cost: 3.8013e+23, est. time: 181014058.81 GHz days (not accurate yet!)
# Optimized skew: 1.71669 Murphy: 6.63e-19
skew: 1.71669
c7: 1
c0: 8
Y1: -1
Y0: 200867255532373784442745261542645325315275374222849104412672
type: snfs