2+(odd)

2^1303+1

Open composite · C327

NFS Planning

GNFS Murphy estimate: 2.41e-22
SNFS Murphy score: 4.01e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.86929

Identifiers

Target expression: 2^1303+1
Target link: FactorDB page
Target ID: 1000000000012151327
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C327
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 53204563686868873577.6198807295354576621851096919606790761126838017.C327

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 4.01e-18
Skew: 0.86929
Selected: Best

n: 176484298867856543691782584662444377753753956869333429558728092503363865990753619764701182623086190898854340598870369692787073785065705355721650164751168505439980954971989955799560877362908264687383737297085949902682425012355486618413534448621507982967013987989546912774045898752545045193277206360238659863890567386547636705267
# 2^1303+1, difficulty: 392.24, skewness: 1.10
# cost: 1.0255e+23, est. time: 48833452.24 GHz days (not accurate yet!)
# Optimized skew: 0.86929 Murphy: 4.01e-18
skew: 0.86929
c7: 1
c0: 2
Y1: -98079714615416886934934209737619787751599303819750539264
Y0: 1
type: snfs