2LM

2^2978+1 M

Open composite · C328 · component M

NFS Planning

GNFS Murphy estimate: 2.11e-22
SNFS Murphy score: 6.91e-20
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.88537

Identifiers

Target expression: 2^1489+1+2^745
Target value: 17126299858610370482240033183730887692150398379067787511755760754292462817657872169754434026652817022291577347068084725292624291475327128786216327596681982835883767815102098273675196636515362766863614347822333315161794657356115905890020372146819002424360580182937478282852480557587890860482086697146620193519691807494184138898197048027458017184957361104923057578446770627465866255427856921044238408677933490774136241674366165503376538221347491282945
Target link: FactorDB page
Target ID: 1100000000000689021
Target changed: -
Parent query: 2^2978+1
Parent ID: -
Cofactor token: C328
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(2) 42822438543769.6912307198663399085960820684529791591540749.5940231518639818133881548617394754356089382789141290697209920297.C328

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 6.91e-20
Skew: 0.88537
Selected: Best

n: 1948030453157350796836236933795122852341171606188257474801644643610666292802411883796090373894000209522052123168532855449758332347918824467505842411819938332994312821376546463632480128948573018024676706158441620192980806249216327029447171828674746407427867307270794968868272739219193761598805349342795449164925848592385169261377
# 2^2978+1 Aurifeuillian M, difficulty: 448.23, skewness: 0.92
# cost: 2.3494e+24, est. time: 1118763679.50 GHz days (not accurate yet!)
# Optimized skew: 0.88537 Murphy: 6.91e-20
skew: 0.88537
c8: 2
c4: 2
c0: 1
Y1: -1
Y0: 98079714615416886934934209737619787751599303819750539264
type: snfs