cp's OEIS Frontend

A211641 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>=n.

%I A211641 #5 Dec 04 2016 19:46:27
%S A211641 0,1,8,27,63,124,215,339,508,725,993,1324,1718,2186,2733,3358,4079,
%T A211641 4896,5812,6836,7974,9235,10616,12132,13789,15587,17538,19639,21904,
%U A211641 24341,26946,29731,32708,35877,39238,42806,46581,50575,54794,59232
%N A211641 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>=n.
%C A211641 For a guide to related sequences, see A211422.
%t A211641 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A211641     (Do[If[w^2 + x^2 + y^2 >= n, s = s + 1],
%t A211641         {w, 1, #}, {x, 1, #}, {y, 1, #}] &[n]; s)]];
%t A211641 Map[t[#] &, Range[0, 80]]     (* A211641 *)
%t A211641 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A211641 Cf. A211422.
%K A211641 nonn
%O A211641 0,3
%A A211641 _Clark Kimberling_, Apr 18 2012