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 A369529 #16 Feb 01 2024 08:31:48
%S A369529 1,2,3,4,5,6,7,8,9,1,1,1,1,1,1,1,1,1,1,2,1,4,1,2,1,4,1,2,1,3,1,1,3,1,
%T A369529 1,9,1,1,3,4,1,2,1,8,1,2,1,4,1,5,1,1,1,1,5,1,1,1,1,6,1,4,9,2,1,12,1,2,
%U A369529 3,7,1,1,1,1,1,1,7,1,1,8,1,2,1,4,1,2,1,16,1,9,1,1,3
%N A369529 a(n) = gcd(A007953(n), A007954(n)).
%e A369529 a(15) = gcd(A007953(15), A007954(15)) = gcd(6,5) = 1.
%t A369529 a[n_] := GCD @@ Apply[{Plus @@ #, Times @@ #} &, {IntegerDigits[n]}]; Array[a, 100] (* _Amiram Eldar_, Jan 26 2024 *)
%Y A369529 Cf. A007953, A007954, A066308.
%K A369529 nonn,base,easy
%O A369529 1,2
%A A369529 _Ctibor O. Zizka_, Jan 25 2024