2+(4k)

2^1460+1

Open composite · C274

NFS Planning

GNFS Murphy estimate: 2.86e-19
SNFS Murphy score: 3.41e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.08545

Identifiers

Target expression: 2^1460+1
Target link: FactorDB page
Target ID: 1000000000012151484
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C274
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(4,20,292) 696379121.301173880801.11407110975530515104534161.14759145067968270674284288321. C274

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 3.41e-17
Skew: 1.08545
Selected: Best

n: 1840702553092009480266155000765356306956077126726353339546255793629547048238946506036330610791134568048643753261938210730195240180359445168557778909397995689968534662069671682239928104383464178738378099276451884858103970705377683688052749414603530566014324040000128795726961
# 2^1460+1, difficulty: 351.60, skewness: 1.00
# cost: 8.88677e+21, est. time: 4231796.61 GHz days (not accurate yet!)
# Optimized skew: 1.08545 Murphy: 3.41e-17
skew: 1.08545
c8: 1
c6: -1
c4: 1
c2: -1
c0: 1
Y1: -1
Y0: 89202980794122492566142873090593446023921664
type: snfs