2LM

2^2518+1 L

Open composite · C371 · component L

NFS Planning

GNFS Murphy estimate: 6.77e-25
SNFS Murphy score: 6.92e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.82334

Identifiers

Target expression: 2^1259+1-2^630
Target value: 9925777620949172098088493659366689241996061560885147862738716459659202632592544839870681230289768395273610700563698776046165052650760140331401735883405037653850678929700107904217894887601450804265753722591195986415833892869216716958018378123349520872682590510883273260969767122563807121613360883870997849630338742227083046510875916255513727647351532771291391362577281806357233665
Target link: FactorDB page
Target ID: 1100000000003239394
Target changed: -
Parent query: 2^2518+1
Parent ID: -
Cofactor token: C371
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(2) 28277141. C371

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 6.92e-18
Skew: 0.82334
Selected: Best

n: 70203544417373539270384468213152731685258149406866471138215256341927938419181379333014474343709418114607913866283007720237099306827095004628662677626461866522154265381355971625405092315389669728391238156581643005676096412075157930273208158656135150810915364540448224670024222905447245332287029186373529414662810092626288113857592012258337769347697016266894813464892237913
# 2^2518+1 Aurifeuillian L, difficulty: 379.00, skewness: 0.77
# cost: 4.70263e+22, est. time: 22393464.11 GHz days (not accurate yet!)
# Optimized skew: 0.82334 Murphy: 6.92e-18
skew: 0.82334
c8: 8
c4: -4
c0: 1
Y1: -1
Y0: 182687704666362864775460604089535377456991567872
type: snfs