Woodall Number
A Woodall number is a number of the form
 |
Woodall numbers are therefore similar to Mersenne numbers 
but with an additional factor of
multiplying the power of 2, and to Cullen
numbers 
but with the sign flipped.
For 
, 2, ..., the first few Woodall numbers
are 1, 7, 23, 63, 159, 383, ... (OEIS A003261).
A Woodall number that is prime is known as a Woodall prime.
Cunningham, A. J. C. and Woodall, H. J. "Factorisation of 
and 
."
Messenger Math. 47, 1-38, 1917.
Ribenboim, P. The New Book of Prime Number Records. New York: Springer-Verlag, pp. 360-361, 1996.
Sloane, N. J. A. Sequence A003261/M4379 in "The On-Line Encyclopedia of Integer Sequences."
Weisstein, Eric W. "Woodall Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/WoodallNumber.html
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