2+(4k)

2^1360+1

Open composite · C309

NFS Planning

GNFS Murphy estimate: 2.67e-21
SNFS Murphy score: 1.50e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.10060

Identifiers

Target expression: 2^1360+1
Target link: FactorDB page
Target ID: 1000000000012151384
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C309
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(16,80,272) C309

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 1.50e-16
Skew: 1.10060
Selected: Best

n: 179772056548265987617271998343068211454243119312134730812715354527210293130529015442703274898092943027867304582189398403134368303415223681404446218913645819149414719828345641134448706381015744513054368932429137348592529764264847221786469942544282639339428457903053619231697236130993312614773832060762884997121
# 2^1360+1, difficulty: 327.52, skewness: 1.00
# cost: 1.92333e+21, est. time: 915870.70 GHz days (not accurate yet!)
# Optimized skew: 1.10060 Murphy: 1.50e-16
skew: 1.10060
c8: 1
c6: -1
c4: 1
c2: -1
c0: 1
Y1: -1
Y0: 87112285931760246646623899502532662132736
type: snfs