Woodall number

A Woodall numberMathworldPlanetmath Wm is a number of the form 2mm-1, where m is an integer. It is believed that almost all Woodall numbers are composite. The first few Woodall numbers are 1, 7, 23, 63, 159, 383, 895, 2047, 4607 (listed in A003261 of Sloane’s OEIS). Though having some things in common with the Cullen numbersMathworldPlanetmath, no Woodall number is a Proth number.

Title Woodall number
Canonical name WoodallNumber
Date of creation 2013-03-22 17:44:18
Last modified on 2013-03-22 17:44:18
Owner PrimeFan (13766)
Last modified by PrimeFan (13766)
Numerical id 5
Author PrimeFan (13766)
Entry type Definition
Classification msc 11A51
Related topic CullenNumber