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 A250482 #21 Nov 27 2014 03:33:31
%S A250482 1,2,3,4,5,6,8,9,10,11,12,13,16,17,18,20,24,25,26,27,29,32,33,36,37,
%T A250482 38,40,41,44,48,50,51,52,53,57,64,65,66,68,72,73,80,81,82,83,85,89,96,
%U A250482 97,100,101,102,104,108,113,116,122,123,125,128,129,132,137,144
%N A250482 Numbers of the form 2^x + y^2, with x and y >=0.
%C A250482 No terms are congruent to 7 mod 8: subsequence of A004777.
%H A250482 Vincenzo Librandi, <a href="/A250482/b250482.txt">Table of n, a(n) for n = 1..2500</a>
%e A250482 12 is in this sequence because 2^3+2^2 = 12.
%e A250482 51 is in this sequence because 2^1+7^2 = 51.
%t A250482 nn=15; Union[Select[Flatten[Table[2^x + y^2, {x, 0, nn}, {y, 0, nn}]], # <=nn^2 &]]
%o A250482 (PARI) isok(n) = {k=0; while (2^k <= n, if (issquare(n - 2^k), return(1)); k++;); return (0);} \\ _Michel Marcus_, Nov 24 2014
%Y A250482 Cf. A004777, A250481.
%Y A250482 Cf. sequences of the type k^x+y^k: this sequence (k=2), A250483 (k=3), A250545 (k=4), A250546 (k=5), A250547 (k=6), A250715 (k=7).
%K A250482 nonn
%O A250482 1,2
%A A250482 _Vincenzo Librandi_, Nov 24 2014