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 A290275 #4 Jul 26 2017 09:31:47
%S A290275 1,9,10,25,26,34,35,49,50,58,59,74,75,81,82,83,84,90,91,106,107,115,
%T A290275 116,121,122,130,131,139,140,146,147,155,156,164,165,169,170,171,178,
%U A290275 179,180,194,195,196,202,203,204,205,211,212,218,219,225,226,227,228,234,235,236,237,243,244,250,251,252,253
%N A290275 Numbers that are the sum of distinct odd positive squares.
%C A290275 Complement of A167703.
%C A290275 1922 is the largest of positive integers not in this sequence.
%H A290275 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>
%H A290275 <a href="/index/Ce#CENTRALCUBE">Index entries for sequences related to centered polygonal numbers</a>
%e A290275 139 is in the sequence because 139 = 9 + 49 + 81 = 3^2 + 7^2 + 9^2.
%t A290275 max = 253; f[x_] := Product[1 + x^(2 k + 1)^2, {k, 0, 10}]; Exponent[#, x] & /@ List @@ Normal[Series[f[x], {x, 0, max}]] // Rest
%Y A290275 Cf. A003995, A016754, A097269, A167700, A167703.
%K A290275 nonn
%O A290275 1,2
%A A290275 _Ilya Gutkovskiy_, Jul 25 2017