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 A387087 #8 Aug 16 2025 12:50:24 %S A387087 1,2,2,3,3,3,2,2,2,7,7,3,2,4,5,5,5,5,2,2,2,2,11,11,3,9,2,2,2,19,19,3, %T A387087 2,2,2,2,2,2,2,5,5,3,13,13,5,2,2,7,7,3,17,17,2,2,2,31,31,3,2,2,2,2,2, %U A387087 2,2,2,2,2,5,5,3,23,23,2,47,47,3,2,2,2,2,2 %N A387087 GCD of pairs of consecutive terms of the sequence A386482. %H A387087 Rémy Sigrist, <a href="/A387087/b387087.txt">Table of n, a(n) for n = 1..10000</a> %H A387087 Rémy Sigrist, <a href="/A387087/a387087.gp.txt">PARI program</a> %F A387087 a(n) = gcd(A386482(n), A386482(n+1)). %e A387087 The first terms, alongside the first terms of A386482, are: %e A387087 n a(n) A386482(n) %e A387087 -- ---- ---------- %e A387087 1 1 1 %e A387087 2 2 2 %e A387087 3 2 4 %e A387087 4 3 6 %e A387087 5 3 3 %e A387087 6 3 9 %e A387087 7 2 12 %e A387087 8 2 10 %e A387087 9 2 8 %e A387087 10 7 14 %e A387087 11 7 7 %e A387087 12 3 21 %e A387087 13 2 18 %e A387087 14 4 16 %o A387087 (PARI) \\ See Links section. %Y A387087 Cf. A073734, A386482. %K A387087 nonn %O A387087 1,2 %A A387087 _Rémy Sigrist_, Aug 16 2025