%I #12 Nov 16 2024 18:16:15
%S 1,3,5,9,11,17,29,41
%N Odd positive integers that are not the sum of four positive squares.
%D J. H. Conway, The Sensual (Quadratic) Form, M.A.A., 1997, p. 140.
%D L. E. Dickson, History of the Theory of Numbers. Carnegie Institute Public. 256, Washington, DC, Vol. 1, 1919; Vol. 2, 1920; Vol. 3, 1923, see vol. 2, p. 302.
%t sm4=Union[Total/@Tuples[Range[10]^2,4]];Select[Range[1,100,2],!MemberQ[sm4,#]&] (* _James C. McMahon_, Nov 15 2024 *)
%Y Odd terms of A000534.
%K nonn,fini,full
%O 1,2
%A _N. J. A. Sloane_, Sep 27 2006