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 A308895 #9 Jul 02 2019 08:50:13 %S A308895 149,152,218,354,659,663,664,668,686,693,716,747,1211,1276,1281,1460, %T A308895 1467,1545,1827,2189,2278,2283,2522,2529,2631,2997,3455,3568,3573, %U A308895 3872,3879,4005,4455,5009,5146,5151,5510,5517,5667,6201,6851,7012,7017,7436,7443 %N A308895 Positions of 4's on the spiral defined in A308890. %C A308895 Add 1 to the terms of A308889. %Y A308895 Cf. A308884-A308895. %K A308895 nonn %O A308895 1,1 %A A308895 _N. J. A. Sloane_, Jul 01 2019 %E A308895 More terms from _Rémy Sigrist_, Jul 02 2019