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 A249694 #7 Aug 01 2019 03:48:11 %S A249694 1,2,1,1,4,1,1,2,1,1,2,1,1,2,3,1,2,5,1,2,1,1,2,1,1,6,1,1,2,1,1,2,3,1, %T A249694 2,3,1,4,3,1,2,1,1,2,1,3,2,1,3,4,1,1,8,1,1,6,1,1,6,1,1,2,5,1,2,3,1,4, %U A249694 3,1,2,3,1,2,3,1,2,3,1,2,3,1,4,1,1,2 %N A249694 a(n) = gcd(A084937(n), A084937(n+3)). %C A249694 gcd(A084937(n), A084937(n+1)) = gcd(A084937(n), A084937(n+2)) = 1 by definition of A084937. %H A249694 Reinhard Zumkeller, <a href="/A249694/b249694.txt">Table of n, a(n) for n = 1..10000</a> %o A249694 (Haskell) %o A249694 a249694 n = a249694_list !! (n-1) %o A249694 a249694_list = zipWith gcd (drop 3 a084937_list) a084937_list %Y A249694 Cf. A084937. %K A249694 nonn %O A249694 1,2 %A A249694 _Reinhard Zumkeller_, Nov 04 2014