Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #18 Oct 04 2023 05:38:52
%S 0,1,2,4,5,8,10,14,16,20,26,29,30,32,40,46,50,56,62,64,65,74,78,80,94,
%T 104,110,116,120,126,128,142,158,160,170,174,184,190,200,206,222,224,
%U 238,248,254,256,260,270,286,296,302,312,318,320,334,350,366
%N Numbers k for which no numbers w,x,y, all in {1,...,k}, satisfy w^2 + x^2 + y^2 = 2k.
%C For a guide to related sequences, see A211422.
%t t = Compile[{{n, _Integer}}, Module[{s = 0},
%t (Do[If[w^2 + x^2 + y^2 == 2 n, s = s + 1],
%t {w, 1, #}, {x, 1, #}, {y, 1, #}] &[n]; s)]];
%t Map[t[#] &, Range[0, 400]] (* A211649 *)
%t -1 + Flatten[Position[%, 0]] (* this sequence *)
%t (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y Cf. A211422.
%K nonn
%O 0,3
%A _Clark Kimberling_, Apr 18 2012