OFFSET
1,1
COMMENTS
Subsequence of A112355: it doesn't require the three positive triangular numbers to be distinct.
EXAMPLE
MATHEMATICA
trnos=Accumulate[Range[200]];
Take[Union[Select[Total/@Subsets[trnos, {3}], MemberQ[trnos, #]&]], 50] (* Harvey P. Dale, Jan 15 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Sep 05 2005
STATUS
approved