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 A236711 #27 Jul 07 2015 07:26:13
%S A236711 5281250,9031250,21125000,26281250,36125000,42781250,47531250,
%T A236711 52531250,81281250,84500000,87781250,105125000,116281250,126953125,
%U A236711 144500000,166015625,166531250,171125000,190125000,210125000,236531250,241340450,247531250,253906250,258781250
%N A236711 Numbers that are the sum of 2 nonzero squares in exactly 11 ways.
%C A236711 Are all terms multiples of 5?
%C A236711 The answer is "no"; 2789895602 = 2 * 13^6 * 17^2 is a term that is not a multiple of 5. Is it the first such term? - _Zak Seidov_, Jul 05 2015
%C A236711 a(152) = 2789895602 is the first term that is not divisible by 5. In the first 1000 terms, the only powers to which 5 appears as a factor are 0 (for 10 terms, beginning with a(152), after which the next does not occur until a(331)), 2 (for only 14 terms, the smallest of which is a(22) = 241340450 = 2 * 5^2 * 13^6), 6 (for 360 terms), and 10 (for the remaining 616 terms). - _Jon E. Schoenfield_, Jul 07 2015
%H A236711 Jon E. Schoenfield, <a href="/A236711/b236711.txt">Table of n, a(n) for n = 1..1000</a>
%H A236711 C. Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_062.htm">Puzzle 62</a>
%e A236711 5281250 = x^2 + y^2 with {x,y} = {71,2297}, {245,2285}, {325,2275}, {575,2225}, {875,2125}, {949,2093}, {1105,2015}, {1175,1975}, {1435,1795}, {1567,1681}, {1625,1625}.
%Y A236711 Cf. A000404, A016032, A025285-A025293.
%K A236711 nonn
%O A236711 1,1
%A A236711 _Zak Seidov_, Jan 30 2014
%E A236711 More terms from _Jon E. Schoenfield_, Jul 05 2015