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).
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."