2+(4k)

2^1300+1

Open composite · C264

NFS Planning

GNFS Murphy estimate: 1.09e-18
SNFS Murphy score: 3.60e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.10781

Identifiers

Target expression: 2^1300+1
Target link: FactorDB page
Target ID: 1000000000012151324
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C264
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(4,20,52,100,260) 15601.3249204401.1065641262401. C264

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 3.60e-16
Skew: 1.10781
Selected: Best

n: 180407984061221584650765212709691727214108024260628900628263654261798077729704957553850426349782890961754522074039392402572592218901795634013868950546164416711840262045537543262629677196444928827337673770994675644936508453033116082056888806508686236240834070458401
# 2^1300+1, difficulty: 313.07, skewness: 1.00
# cost: 7.43083e+20, est. time: 353849.20 GHz days (not accurate yet!)
# Optimized skew: 1.10781 Murphy: 3.60e-16
skew: 1.10781
c8: 1
c6: -1
c4: 1
c2: -1
c0: 1
Y1: -1
Y0: 1361129467683753853853498429727072845824
type: snfs