2+(odd)

2^1153+1

Open composite · C306

NFS Planning

GNFS Murphy estimate: 3.99e-21
SNFS Murphy score: 1.15e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.53357

Identifiers

Target expression: 2^1153+1
Target link: FactorDB page
Target ID: 1000000000012151177
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C306
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 27673.3772896236651.1815221738378898021554747. C306

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 1.15e-16
Skew: 1.53357
Selected: Best

n: 215180522460109500563034440303435274837362205173519969899594659433365794164947055668224454593326857781809158219813744123264142616355781301908115101267179242066004941038653740207526187291604675837326434710240316266353248402895955843163085830623224083991375798616982771036885381016552983024090441679669873451
# 2^1153+1, difficulty: 347.69, skewness: 1.22
# cost: 6.96044e+21, est. time: 3314496.64 GHz days (not accurate yet!)
# Optimized skew: 1.53357 Murphy: 1.15e-16
skew: 1.53357
c7: 1
c0: 4
Y1: -1
Y0: 46768052394588893382517914646921056628989841375232
type: snfs