2+(4k)

2^1292+1

Open composite · C320

NFS Planning

GNFS Murphy estimate: 6.15e-22
SNFS Murphy score: 1.53e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.23783

Identifiers

Target expression: 2^1292+1
Target link: FactorDB page
Target ID: 1000000000012151316
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C320
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(4,68,76) 1685694802571764886364908561. C320

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 1.53e-17
Skew: 1.23783
Selected: Best

n: 38557156290682079963320362504579597057451354735618121718998568469457812965678747816141009755698099904778289909713623359528515795011959301251193955191014131445239685098641045087421425847067326004548962930434404810082926442109049875338579985745188647262257213359536562505600829025199868797570781395630981324250113503155201
# 2^1292+1, difficulty: 366.05, skewness: 1.00
# cost: 2.16016e+22, est. time: 10286494.15 GHz days (not accurate yet!)
# Optimized skew: 1.23783 Murphy: 1.53e-17
skew: 1.23783
c8: 1
c7: -1
c6: -7
c5: 6
c4: 15
c3: -10
c2: -10
c1: 4
c0: 1
Y1: -75557863725914323419136
Y0: 5708990770823839524233143877797980545530986497
type: snfs