2+(odd)

2^1421+1

Open composite · C216

Target FactorDB

NFS Planning

GNFS Murphy estimate
6.62e-16
SNFS Murphy score
8.61e-18
Preferred method
GNFS
SNFS possible
Yes
SNFS degree
6
SNFS skew
1.42449

Identifiers

Target expression
2^1421+1
Target link
FactorDB page
Target ID
1000000000012151445
Target changed
-
Parent query
Same as target
Parent ID
-
Cofactor token
C216
Imported
Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,7,29,49,203) 2843.2802958225638718627796887824397276031089.293164921245346012759170161524756839839111329.4029208313832481481143451623067247504863024402428753.C216

SNFS Polynomial

Degree
6
Murphy
8.61e-18
Skew
1.42449
Selected
Best
n: 109882727716999866799211270563330644584179178409311332261854745437012548229822854138867048798911098288654865080230327167546000325150398104753884205857981610998272243909612204260721199994034387792299451939226070452339
# 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