5^556+1

Open composite · C386

NFS Planning

GNFS Murphy estimate: 9.13e-26
SNFS Murphy score: 4.54e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.57208

Identifiers

Target expression: 5^556+1
Target link: FactorDB page
Target ID: 1000000000016637349
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C386
Imported: Jun 03, 2026, 04:31 PM UTC

Raw pmain126 Factorization

(4) C386

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 4.54e-18
Skew: 1.57208
Selected: Best

n: 67724854023999756013020567673709372648797463653640862653311543052377049045558747777103059718777615428954894874772771820515236206589385859209483830284643786299954652965701941112890996428475617089541037588784315771959421347849253496492170200625611230268277799820573354890349490402756727111661523505136398442112202189097373509504029478450808045481014438852434986969479322492981109375390001
# 5^556+1, difficulty: 388.63, skewness: 1.99
# cost: 8.30276e+22, est. time: 39536973.20 GHz days (not accurate yet!)
# Optimized skew: 1.57208 Murphy: 4.54e-18
skew: 1.57208
c7: 1
c0: 125
Y1: -16543612251060553497428173841399257071316242218017578125
Y0: 1
type: snfs