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 A082457 #12 Mar 15 2018 05:01:34
%S A082457 1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,3,1,1,1,1,1,15,1,1,3,1,1,1,1,1,1,1,1,3,
%T A082457 1,1,3,1,1,1,1,1,3,1,7,1,5,1,3,1,1,3,1,1,1,1,1,1,1,1,3,1,1,1,1,1,15,1,
%U A082457 1,3,1,5,1,1,1,9,1,1,3,1,1,3,1,1,1,1,1,3,1,1,1,1,1,7,1,1,15,1,1,1,1,1,3,1,1
%N A082457 a(n) = gcd(1+2n, A057643(1+2n)).
%C A082457 This and A066715 are mostly equal; for differences see A083344.
%e A082457 n=22: 2n+1=45, A057643(45)=5520, a(22)=gcd(45,5520)=15 while A066715(45)=3.
%t A082457 di[x_] := Apply[LCM, Divisors[x]+1] Table[GCD[2*w+1, di[1+2*w]], {w, 1, 2048}];
%Y A082457 Cf. A057643, A066715, A000203, A083344.
%K A082457 nonn
%O A082457 1,7
%A A082457 _Labos Elemer_, Apr 25 2003