OFFSET
0,3
COMMENTS
a(n) increases as n^1.42.
EXAMPLE
15 occurs since it can be written as 1 + 1 + 13; 16 does not occur since it cannot be written as a sum of at most 3 terms from the set {0,1,4,13,32,...} = A051912.
MATHEMATICA
li=Take[A051912, 16]; Select[Union[Flatten[Outer[Plus, li, li, li]]], # <= Last[li] &]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Wouter Meeussen, Mar 20 2004
STATUS
approved