2^1421-1

Open composite · C316

NFS Planning

GNFS Murphy estimate: 1.05e-21
SNFS Murphy score: 8.61e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 6
SNFS skew: 1.42449

Identifiers

Target expression: 2^1421-1
Target link: FactorDB page
Target ID: 1000000000000001421
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C316
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(7,29,49,203) 15699209.25652284247188456525842519940799. C316

SNFS Polynomial

Polynomial

Degree: 6
Murphy: 8.61e-18
Skew: 1.42449
Selected: Best

n: 2528510942219543394073449177673445543248951475601036680563565851834102100817563702652984450809197276848719355752136774915942699868192577780990910117362148067721347235660705702959702833979228228174172698441348221835591765772413724907692932315294783345778056561560633379381640773407538284570722592146079311950049215111
# 2^1421-1, difficulty: 366.65, skewness: 1.00
# cost: 2.24057e+22, est. time: 10669387.91 GHz days (not accurate yet!)
# Optimized skew: 1.42449 Murphy: 8.61e-18
skew: 1.42449
c6: 1
c5: 1
c4: 1
c3: 1
c2: 1
c1: 1
c0: 1
Y1: -1
Y0: 12855504354071922204335696738729300820177623950262342682411008
type: snfs