An even number of the form 
(i.e., an integer
which is divisible by 2 but not by 4). The first few
for 
,
1, 2, ... are 2, 6, 10, 14, 18, ... (OEIS A016825)
Singly Even Number
See also
Doubly Even Number, Even Number, Odd NumberExplore with Wolfram|Alpha
References
Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, p. 30, 1996.Sloane, N. J. A. Sequence A016825 in "The On-Line Encyclopedia of Integer Sequences."Referenced on Wolfram|Alpha
Singly Even NumberCite this as:
Weisstein, Eric W. "Singly Even Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SinglyEvenNumber.html