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 A343395 #7 Apr 16 2021 10:04:15
%S A343395 1,2,3,5,5,12,7,13,13,26,11,39,13,36,37,33,17,74,19,69,57,68,23,103,
%T A343395 41,82,55,97,29,226,31,81,109,130,103,207,37,140,129,193,41,324,43,
%U A343395 177,183,164,47,281,85,266,163,213,53,340,175,287,201,210,59,621,61,220,289
%N A343395 a(n) = Sum_{i=1..n} gcd(n^(n-i),n-i).
%t A343395 Table[Sum[GCD[n^(n - i), n - i], {i, n}], {n, 100}]
%o A343395 (PARI) a(n) = sum(i=1, n, gcd(n^(n-i), n-i)); \\ _Michel Marcus_, Apr 15 2021
%Y A343395 Cf. A018804 (Pillai's function), A342449, A343114.
%K A343395 nonn
%O A343395 1,2
%A A343395 _Wesley Ivan Hurt_, Apr 13 2021