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 A275172 #15 Sep 01 2016 21:33:05 %S A275172 2,5,16,25,33,40,78,89,158,172,221,237,376,395,415,523,570,749,777, %T A275172 790,876,923,1016,1114,1182,1303,1341,1473,1512,1754,1839,1970,2105, %U A275172 2267,2315,2488,2538,2957,3012,3204,3262,3467,3527,3646,3983,4110,4276,4744,4815 %N A275172 Positions of 3 in A274640. %H A275172 Alois P. Heinz, <a href="/A275172/b275172.txt">Table of n, a(n) for n = 1..10074</a> %H A275172 Alois P. Heinz, <a href="/A275172/a275172.jpg">Positions of first 1411 3's in plane of A274640</a> %F A275172 A274640(a(n)) = 3. %Y A275172 Cf. A274640, A273059, A275116, A275188, A275189, A275190, A275191, A275192, A275193, A275194. %K A275172 nonn %O A275172 1,1 %A A275172 _Zak Seidov_, Jul 19 2016