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 A343114 #14 Apr 06 2021 09:56:26
%S A343114 1,3,5,8,9,17,13,20,21,35,21,50,25,49,51,48,33,91,37,88,77,89,45,126,
%T A343114 65,107,81,124,57,255,61,112,141,163,137,242,73,177,167,232,81,365,85,
%U A343114 220,227,209,93,328,133,315,213,264,105,393,229,342,257,267,117,680,121,281
%N A343114 a(n) = Sum_{i=1..n} gcd(n^i,i).
%H A343114 Seiichi Manyama, <a href="/A343114/b343114.txt">Table of n, a(n) for n = 1..1000</a>
%F A343114 If p is prime, a(p) = 2*p -1. - _Seiichi Manyama_, Apr 06 2021
%t A343114 Table[Sum[GCD[n^i, i], {i, n}], {n, 100}]
%o A343114 (PARI) a(n) = sum(i=1, n, gcd(n^i, i)); \\ _Michel Marcus_, Apr 05 2021
%Y A343114 Cf. A018804 (Pillai's function), A342449.
%K A343114 nonn
%O A343114 1,2
%A A343114 _Wesley Ivan Hurt_, Apr 05 2021