2^1357-1

Open composite · C374

NFS Planning

GNFS Murphy estimate: 4.54e-25
SNFS Murphy score: 1.11e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.40689

Identifiers

Target expression: 2^1357-1
Target link: FactorDB page
Target ID: 1000000000000001357
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C374
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(23,59) 21713.445097. C374

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 1.11e-18
Skew: 1.40689
Selected: Best

n: 67308517305953428959727919155199103855943735992949505617368110301517301660572471490183099703538869294979575837485075111946175043328498150976398785909600198555642993194084144043228860684757736930857263721167596226458891533930485268796320551966166926050188727571210353619341722457990394065563233935463028134957997059321547807789220788275986317730475109819059306038140963313079
# 2^1357-1, difficulty: 408.80, skewness: 1.10
# cost: 2.65851e+23, est. time: 126595743.78 GHz days (not accurate yet!)
# Optimized skew: 1.40689 Murphy: 1.11e-18
skew: 1.40689
c7: 1
c0: -2
Y1: -1
Y0: 25108406941546723055343157692830665664409421777856138051584
type: snfs