2LM

2^2438+1 L

Open composite · C256 · component L

Target FactorDB

NFS Planning

GNFS Murphy estimate
3.17e-18
SNFS Murphy raw
8.60e-18
SNFS Murphy normalized (deg 6)
8.60e-18
Preferred method
Similar
SNFS possible
Yes
SNFS degree
6
SNFS skew
1.23926

Identifiers

Target expression
2^1219+1-2^610
Target value
9027442157229572420045309317508044152415151584941802741685675263997111535529752327302668373058412176099964836397429076938501614359447685575470801162196073759196841756147576146957267049337602718268537014753432655605030748001170369733660772119095407821549161144596934448532290856797131590420787880148752926082574460430659205031880349883555427461126056245965867150475265
Target link
FactorDB page
Target ID
1100000000000591954
Target changed
Before 6/8/2026
Parent query
2^2438+1
Parent ID
1000000000012152462
Cofactor token
C256
Imported
Jun 07, 2026, 01:41 AM UTC

Raw pmain126 Factorization

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

SNFS Polynomial

Degree
6
Raw Murphy
8.60e-18
Normalized (deg 6)
8.60e-18
Skew
1.23926
Selected
Best
n: 2515912720578388330059116481856958509760761046008739671647714271603624435012257321761060872292836313249414296753838512042958592267464543328443543329866058845644752474207045534623600720408876324685154389511615089829646313082243039623643596143573428673024149
# 2^2438+1 Aurifeuillian L, difficulty: 366.96, skewness: 0.89
# cost: 2.28186e+22, est. time: 10865999.63 GHz days (not accurate yet!)
# Optimized skew: 1.23926 Murphy: 8.60e-18
skew: 1.23926
c6: 2
c3: -2
c0: 1
Y1: -1
Y0: 12855504354071922204335696738729300820177623950262342682411008
type: snfs