A123069 Odd positive integers that are not the sum of four positive squares.

1, 3, 5, 9, 11, 17, 29, 41

Offset: 1

Author

N. J. A. Sloane, Sep 27 2006

Keywords

• nonn
• fini
• full

References

• J. H. Conway, The Sensual (Quadratic) Form, M.A.A., 1997, p. 140.
• 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.

Crossrefs

Odd terms of A000534.

Programs

Mathematica

sm4=Union[Total/@Tuples[Range[10]^2,4]];Select[Range[1,100,2],!MemberQ[sm4,#]&] (* James C. McMahon, Nov 15 2024 *)