This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A047701 #26 Sep 03 2013 05:42:02
%S A047701 1,2,3,4,6,7,9,10,12,15,18,33
%N A047701 All positive numbers that are not the sum of 5 nonzero squares.
%D A047701 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 33, pp 12, Ellipses, Paris 2008.
%D A047701 E. Grosswald, Representations of Integers as Sums of Squares. Springer-Verlag, NY, 1985, Theorem 2., p. 73.
%D A047701 Ivan Niven and Herbert S. Zuckerman, An Introduction to the Theory of Numbers, New York: John Wiley (1980), p. 145
%H A047701 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>
%e A047701 4 = 1^2 + 1^2 + 1^2 + 1^2 + 0^2, but the last square is 0, and hence 4 is in the sequence.
%e A047701 5 = 1^2 + 1^2 + 1^2 + 1^2 + 1^2, and therefore 5 is not in the sequence.
%t A047701 Select[ Range[100], Select[ PowersRepresentations[#, 5, 2], FreeQ[#, 0]& ] == {}& ] (* _Jean-François Alcover_, Sep 03 2013 *)
%Y A047701 Cf. A047700, A000534, A180968 (not the sum of 6 squares).
%K A047701 nonn,full,fini
%O A047701 1,2
%A A047701 Arlin Anderson (starship1(AT)gmail.com)
%E A047701 Name changed. - _Wolfdieter Lang_, Mar 28 2013