2LM

2^2518+1 L

Open composite · C371 · component L

Target FactorDB

NFS Planning

GNFS Murphy estimate
6.77e-25
SNFS Murphy raw
2.74e-18
SNFS Murphy normalized (deg 6)
2.74e-18
Preferred method
SNFS
SNFS possible
Yes
SNFS degree
6
SNFS skew
1.56726

Identifiers

Target expression
2^1259+1-2^630
Target value
9925777620949172098088493659366689241996061560885147862738716459659202632592544839870681230289768395273610700563698776046165052650760140331401735883405037653850678929700107904217894887601450804265753722591195986415833892869216716958018378123349520872682590510883273260969767122563807121613360883870997849630338742227083046510875916255513727647351532771291391362577281806357233665
Target link
FactorDB page
Target ID
1100000000003239394
Target changed
Before 6/8/2026
Parent query
2^2518+1
Parent ID
1000000000012152542
Cofactor token
C371
Imported
Jun 07, 2026, 01:41 AM UTC

Raw pmain126 Factorization

(2) 28277141. C371

SNFS Polynomial

Degree
6
Raw Murphy
2.74e-18
Normalized (deg 6)
2.74e-18
Skew
1.56726
Selected
Best
n: 70203544417373539270384468213152731685258149406866471138215256341927938419181379333014474343709418114607913866283007720237099306827095004628662677626461866522154265381355971625405092315389669728391238156581643005676096412075157930273208158656135150810915364540448224670024222905447245332287029186373529414662810092626288113857592012258337769347697016266894813464892237913
# 2^2518+1 Aurifeuillian L, difficulty: 379.30, skewness: 1.12
# cost: 4.78756e+22, est. time: 22797912.74 GHz days (not accurate yet!)
# Optimized skew: 1.56726 Murphy: 2.74e-18
skew: 1.56726
c6: 1
c3: -2
c0: 2
Y1: -1
Y0: 1645504557321206042154969182557350504982735865633579863348609024
type: snfs