2^1259-1

Open composite · C309

NFS Planning

GNFS Murphy estimate: 2.67e-21
SNFS Murphy score: 1.08e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.39860

Identifiers

Target expression: 2^1259-1
Target link: FactorDB page
Target ID: 1000000000000001259
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C309
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

875965965904153.12837801903260418659222502180271368969172790209999210831.C309

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 1.08e-17
Skew: 1.39860
Selected: Best

n: 882646164368690199129611655924099827958731175166587509102470233638455957016933397355915800640869793244995862969887477044570741562537039275078495132226801652755103067272226040277727893198039936122714066782456150066754430546206500178050509125238580698168338350268803256419380317735431922382709904312203954684409
# 2^1259-1, difficulty: 379.30, skewness: 1.10
# cost: 4.78756e+22, est. time: 22797912.74 GHz days (not accurate yet!)
# Optimized skew: 1.39860 Murphy: 1.08e-17
skew: 1.39860
c7: 1
c0: -2
Y1: -1
Y0: 1532495540865888858358347027150309183618739122183602176
type: snfs