cp's OEIS Frontend

A211647 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2<=3n.

%I A211647 #5 Dec 04 2016 19:46:28
%S A211647 0,1,4,7,11,17,23,32,38,48,60,66,78,87,102,114,121,139,157,169,178,
%T A211647 196,214,232,241,263,284,296,314,329,359,371,386,410,434,452,471,495,
%U A211647 516,540,555,582,612,630,651,678,702,729,738,772,805,829,853,871
%N A211647 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2<=3n.
%C A211647 For a guide to related sequences, see A211422.
%t A211647 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A211647     (Do[If[w^2 + x^2 + y^2 <= 3 n, s = s + 1],
%t A211647         {w, 1, #}, {x, 1, #}, {y, 1, #}] &[n]; s)]];
%t A211647 Map[t[#] &, Range[0, 80]]  (* A211647 *)
%t A211647 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A211647 Cf. A211422.
%K A211647 nonn
%O A211647 0,3
%A A211647 _Clark Kimberling_, Apr 18 2012