cp's OEIS Frontend

A211646 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2<3n.

%I A211646 #5 Dec 04 2016 19:46:28
%S A211646 0,0,1,4,10,17,20,26,35,44,54,60,75,87,96,108,120,133,145,163,178,196,
%T A211646 202,220,238,256,278,284,308,329,347,365,383,401,428,440,467,495,504,
%U A211646 528,549,576,594,612,645,678,690,717,735,765,790,814,853,871
%N A211646 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2<3n.
%C A211646 For a guide to related sequences, see A211422.
%t A211646 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A211646     (Do[If[w^2 + x^2 + y^2 < 3 n, s = s + 1],
%t A211646         {w, 1, #}, {x, 1, #}, {y, 1, #}] &[n]; s)]];
%t A211646 Map[t[#] &, Range[0, 80]]   (* A211646 *)
%t A211646 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A211646 Cf. A211422.
%K A211646 nonn
%O A211646 0,4
%A A211646 _Clark Kimberling_, Apr 18 2012