OFFSET
1,1
FORMULA
{n: A025443(n) = 3}. - R. J. Mathar, Jun 15 2018
MATHEMATICA
With[{upto=950}, Select[Union[Transpose[Select[Tally[Total/@ Subsets[ Range[ Ceiling[ Sqrt[upto-14]]]^2, {4}]], Last[#]==3&]][[1]]], #<=upto&]] (* Harvey P. Dale, Sep 08 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved