2+(odd)

2^1343+1

Open composite · C368

NFS Planning

GNFS Murphy estimate: 1.01e-24
SNFS Murphy score: 6.12e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.22880

Identifiers

Target expression: 2^1343+1
Target link: FactorDB page
Target ID: 1000000000012151367
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C368
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,17,79) 8059.18803. C368

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 6.12e-18
Skew: 1.22880
Selected: Best

n: 47974917049378342647023347444044762554733713870102993168876641170856364358417972962282275034516851949962831110700231929014834073349368842469635097032308313639060134924035174186262611542904790611728856867582934182297778578147856830231829558952836138533865844626522596842185571502446691727687604130378684734186836743355248089159528567441989690220622761840953789839510083
# 2^1343+1, difficulty: 380.50, skewness: 1.00
# cost: 5.14248e+22, est. time: 24487995.22 GHz days (not accurate yet!)
# Optimized skew: 1.22880 Murphy: 6.12e-18
skew: 1.22880
c8: 1
c7: -1
c6: -7
c5: 6
c4: 15
c3: -10
c2: -10
c1: 4
c0: 1
Y1: -604462909807314587353088
Y0: 365375409332725729550921208179070754913983135745
type: snfs