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 A307283 #17 Apr 08 2019 11:34:01 %S A307283 0,25,31,37,43,86,96,106,116,122,134,146,158,363,383,403,423,847,877, %T A307283 907,937,1114,1148,1182,1216,1529,1569,1609,1649,2035,2081,2127,2173, %U A307283 2438,2488,2538,2588,2821,2875,2929,2983,3494,3554,3614,3674,4239,4305,4371 %N A307283 P-positions (indices of 0 values) along the spiral in A307282. %H A307283 Rémy Sigrist, <a href="/A307283/b307283.txt">Table of n, a(n) for n = 1..1409</a> (-1000 <= x <= 1000 and -1000 <= y <= 1000) %H A307283 Rémy Sigrist, <a href="/A307283/a307283.gp.txt">PARI program for A307283</a> %o A307283 (PARI) See Links section. %Y A307283 Cf. A307282. %Y A307283 For coordinates of the two lines of P-positions in the fourth quadrant (the hard-to-see black dots) see A307284-A307287. %K A307283 nonn %O A307283 1,2 %A A307283 _N. J. A. Sloane_, Apr 05 2019 %E A307283 More terms from _Rémy Sigrist_, Apr 06 2019