OFFSET
0,2
COMMENTS
Zeros occur where no number of consecutive integers can be summed to make n; This only happens where n is an even power of two, or zero itself.
Entries where this sequence is nonzero are in A138591.
LINKS
Ray Chandler, Table of n, a(n) for n = 0..10000
EXAMPLE
20 = 2 + 3 + 4 + 5 + 6; No shorter sequence of consecutive integers sums to 20 and so a(20) = the number of elements in {2,3,4,5,6} = 5.
15 = 4 + 5 + 6, but also 15 = 7 + 8, so a(15) = 2, since this is the minimum.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Carl R. White, Jul 22 2009
STATUS
approved