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 A057792 #18 Jun 19 2021 12:37:25 %S A057792 1,1,5,28,288,3126,50069,826696,17604145,388244060,10405071317, %T A057792 285312497280,9211817190184,303160805686506,11415167261421900, %U A057792 438197051187369424,18896062057839751444,827240565046755853710 %N A057792 Sum[k^k], where sum is over positive integers, k, where k <= n and gcd(k,n) = 1. %H A057792 Seiichi Manyama, <a href="/A057792/b057792.txt">Table of n, a(n) for n = 1..387</a> %e A057792 a(4) = 1^1 + 3^3 = 28, since 1 and 3 are the positive integers <= 4 and relatively prime to 4. %o A057792 (PARI) a(n) = sum(k=1, n, if (gcd(k, n)==1, k^k)); \\ _Michel Marcus_, Jun 19 2021 %Y A057792 Cf. A023896, A053818, A053819, A053820, A308481. %K A057792 nonn %O A057792 1,3 %A A057792 _Leroy Quet_, Nov 04 2000