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 A333835 #15 Apr 12 2020 13:58:09 %S A333835 1,2,3,4,17,18,20,21,22,24,27,28,31,33,34,61,80,81,87,90,93,100,131, %T A333835 135,145,146,148,152,154,157,158,160,166,171,172,174,189,194,225,253, %U A333835 268,270,271,276,281,282,291,294,295,298,316,335,338,368,383,397,405 %N A333835 Lexicographically earliest sequence of distinct positive integers, which when mapped onto a square spiral, gives a set without three distinct evenly spaced aligned points. %C A333835 This sequence has similarities with A005836 and A229037. %H A333835 Rémy Sigrist, <a href="/A333835/b333835.txt">Table of n, a(n) for n = 1..10000</a> %H A333835 Rémy Sigrist, <a href="/A333835/a333835.png">Scatterplot of (A174344(a(n)), A274923(a(n))) in the region -10000 <= x, y <= 10000</a> %H A333835 Rémy Sigrist, <a href="/A333835/a333835.txt">C# program for A333835</a> %e A333835 The first terms, mapped onto a square spiral, are: %e A333835 *---*---*---*--61---*---*---*---* %e A333835 | | %e A333835 * *---*---*--34--33---*--31 * %e A333835 | | | | %e A333835 * * 17---*---*---*---* * * %e A333835 | | | | | | %e A333835 * * 18 *---4---3 * * * %e A333835 | | | | | | | | %e A333835 * * * * 1---2 * 28 * %e A333835 | | | | | | | %e A333835 * * 20 *---*---*---* 27 * %e A333835 | | | | | %e A333835 * * 21--22---*--24---*---* * %e A333835 | | | %e A333835 * *---*---*---*---*---*---*---* %e A333835 | %e A333835 *---*---*---*---*---*---*--80--81 %o A333835 (C#) See Links section. %Y A333835 See A333825 for a similar sequences. %Y A333835 Cf. A005836, A174344, A229037, A274923. %K A333835 nonn %O A333835 1,2 %A A333835 _Rémy Sigrist_, Apr 07 2020