5^557-1

Open composite · C299

NFS Planning

GNFS Murphy estimate: 1.02e-20
SNFS Murphy score: 3.66e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 2.52864

Identifiers

Target expression: 5^557-1
Target link: FactorDB page
Target ID: 1000000000018437355
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C299
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(1) 634993369.606665375011622291.1331838958552407301.2083080172993122691257856555284532106406233081.C299

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 3.66e-18
Skew: 2.52864
Selected: Best

n: 49585685920639144894852615191223840568781864702641563165404193791855538353469412502670519649446082153519008198110041827196861418395044197056904160141108410295623464945595715729576035085697010786075454157915345252908791252721523377766314823414184252122882764930357313089068345334281989865549188443819
# 5^557-1, difficulty: 391.42, skewness: 1.99
# cost: 9.77698e+22, est. time: 46557046.52 GHz days (not accurate yet!)
# Optimized skew: 2.52864 Murphy: 3.66e-18
skew: 2.52864
c7: 1
c0: -125
Y1: -1
Y0: 82718061255302767487140869206996285356581211090087890625
type: snfs