2LM

2^2438+1 L

Open composite · C256 · component L

NFS Planning

GNFS Murphy estimate: 3.17e-18
SNFS Murphy score: 1.49e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.83117

Identifiers

Target expression: 2^1219+1-2^610
Target value: 9027442157229572420045309317508044152415151584941802741685675263997111535529752327302668373058412176099964836397429076938501614359447685575470801162196073759196841756147576146957267049337602718268537014753432655605030748001170369733660772119095407821549161144596934448532290856797131590420787880148752926082574460430659205031880349883555427461126056245965867150475265
Target link: FactorDB page
Target ID: 1100000000000591954
Target changed: -
Parent query: 2^2438+1
Parent ID: -
Cofactor token: C256
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(2,46M,106L) 11678021.5070091106021.54700802543280269.73277174089313103832526800729860009648506057087333341.C256

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 1.49e-17
Skew: 0.83117
Selected: Best

n: 2515912720578388330059116481856958509760761046008739671647714271603624435012257321761060872292836313249414296753838512042958592267464543328443543329866058845644752474207045534623600720408876324685154389511615089829646313082243039623643596143573428673024149
# 2^2438+1 Aurifeuillian L, difficulty: 366.96, skewness: 0.77
# cost: 2.28186e+22, est. time: 10865999.63 GHz days (not accurate yet!)
# Optimized skew: 0.83117 Murphy: 1.49e-17
skew: 0.83117
c8: 8
c4: -4
c0: 1
Y1: -1
Y0: 5708990770823839524233143877797980545530986496
type: snfs