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 A308889 #10 Jul 02 2019 11:19:09 %S A308889 148,151,217,353,658,662,663,667,685,692,715,746,1210,1275,1280,1459, %T A308889 1466,1544,1826,2188,2277,2282,2521,2528,2630,2996,3454,3567,3572, %U A308889 3871,3878,4004,4454,5008,5145,5150,5509,5516,5666,6200,6850,7011,7016,7435,7442 %N A308889 Positions of 4's on the spiral defined in A308884. %H A308889 Rémy Sigrist, <a href="/A308889/a308889.gp.txt">PARI program for A308889</a> %o A308889 (PARI) See Links section. %Y A308889 Cf. A308884-A308895. %K A308889 nonn %O A308889 1,1 %A A308889 _N. J. A. Sloane_, Jul 01 2019 %E A308889 More terms from _Rémy Sigrist_, Jul 02 2019