2+(odd)

2^1487+1

Open composite · C340

NFS Planning

GNFS Murphy estimate: 4.25e-23
SNFS Murphy raw: 5.05e-20
SNFS Murphy normalized (deg 6): 3.16e-20
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.04887

Identifiers

Target expression: 2^1487+1
Target link: FactorDB page
Target ID: 1000000000012151511
Target changed: Before 6/8/2026
Parent query: Same as target
Parent ID: -
Cofactor token: C340
Imported: Jun 07, 2026, 01:41 AM UTC

Raw pmain126 Factorization

(1) 321193.5112307.336634730815895563864259673163375963317776707.764306661921531071005607460370828744036933756498403.C340

SNFS Polynomial

Polynomial

Degree: 7
Raw Murphy: 5.05e-20
Normalized (deg 6): 3.16e-20
Skew: 1.04887
Selected: Best

n: 3378101812096586671463810503605882124303196384532172260999890464442478752856876479964892739854372741011274974198962685347301314585311715939396875997057610977284741135267871556722051141425969897348174622022717834907240668020363402880317069759590393782304745854289786767335618108102826059164425513569924125978838855789670246193390837661038233
# 2^1487+1, difficulty: 447.63, skewness: 1.35
# cost: 2.27455e+24, est. time: 1083119245.58 GHz days (not accurate yet!)
# Optimized skew: 1.04887 Murphy: 5.05e-20
skew: 1.04887
c7: 1
c0: 8
Y1: -6582018229284824168619876730229402019930943462534319453394436096
Y0: 1
type: snfs