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 A316665 #9 Jul 12 2018 00:53:01 %S A316665 3,7,1,17,1,15,1,19,1,5,1,43,1,1,1,19,1,5,1,17,1,7,1,167,1,1,1,11,1,3, %T A316665 1,19,1,1,1,67,1,1,1,17,1,17,1,7,1,5,1,211,1,1,1,7,1,11,1,13,1,3,1, %U A316665 139,1,1,1,31,1,9,1,1,1,5,1,109,1,1,1,1,1,3,1 %N A316665 a(n) is the least k > 0 such that k*n does not belong to A002202. %C A316665 All terms are odd. %H A316665 Rémy Sigrist, <a href="/A316665/b316665.txt">Table of n, a(n) for n = 1..10000</a> %H A316665 Rémy Sigrist, <a href="/A316665/a316665.png">Scatterplot of (x, y) such that 1 <= x, y <= 500 and x*y does not belong to A002202</a> %F A316665 a(n) = 1 iff n belongs to A007617. %o A316665 (PARI) a(n) = forstep (k=1, oo, 2, if (!istotient(n*k), return (k))) %Y A316665 Cf. A002202, A007617. %K A316665 nonn %O A316665 1,1 %A A316665 _Rémy Sigrist_, Jul 10 2018