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A212062 Number of (w,x,y,z) with all terms in {1,...,n} and w^2 = x*y*z.

%I A212062 #14 Nov 27 2016 06:59:55
%S A212062 0,1,4,7,16,19,31,34,50,68,80,83,122,125,137,149,185,188,233,236,269,
%T A212062 281,293,296,368,410,422,456,489,492,570,573,630,642,654,666,792,795,
%U A212062 807,819,891,894,954,957,990,1047,1059,1062,1191,1269,1350
%N A212062 Number of (w,x,y,z) with all terms in {1,...,n} and w^2 = x*y*z.
%C A212062 For a guide to related sequences, see A211795.
%H A212062 Chai Wah Wu, <a href="/A212062/b212062.txt">Table of n, a(n) for n = 0..10000</a>
%t A212062 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A212062 (Do[If[w^2 == x*y*z, s = s + 1],
%t A212062 {w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
%t A212062 Map[t[#] &, Range[0, 50]] (* A212062 *)
%t A212062 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A212062 Cf. A211795.
%K A212062 nonn
%O A212062 0,3
%A A212062 _Clark Kimberling_, Apr 30 2012