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 A338450 #9 Oct 29 2020 02:41:53 %S A338450 1,6,10,18,37,67,77,81,90,124,156,160,185,205,259,289,330,376,429,452, %T A338450 492,501,513,600,609,618,622,674,683,710,743,796,821,945,1038,1060, %U A338450 1086,1214,1312,1316,1493,1556,1735,1764,1929,1938,2052,2216,2230,2259,2521 %N A338450 Numbers k such that A338338(k) and A338338(k+1) are coprime. %H A338450 Rémy Sigrist, <a href="/A338450/b338450.txt">Table of n, a(n) for n = 1..10000</a> %H A338450 Rémy Sigrist, <a href="/A338450/a338450.txt">C program for A338450</a> %e A338450 gcd(A338338(6), A338338(7)) = gcd(9, 5) = 1, so 6 belongs to the sequence. %e A338450 gcd(A338338(2), A338338(3)) = gcd(2, 4) = 2, so 2 does not belong to the sequence. %o A338450 (C) See Links section. %Y A338450 Cf. A280774, A338338. %K A338450 nonn %O A338450 1,2 %A A338450 _Rémy Sigrist_, Oct 28 2020