An Integer of the form , where is an Integer. The odd numbers are therefore ..., ,
, 1, 3, 5, 7, ... (Sloane's A005408), which are also the Gnomic Numbers. The
Generating Function for the odd numbers is
Since the odd numbers leave a remainder of 1 when divided by two, for odd . Integers which are not odd are called Even.
See also Even Number, Gnomic Number, Nicomachus's Theorem, Odd Number Theorem, Odd Prime
Sloane, N. J. A. Sequence
in ``An On-Line Version of the Encyclopedia of Integer Sequences.''
http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.
The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.