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 A385100 #15 Jul 01 2025 10:17:46 %S A385100 1,2,66,182,30,858,4830,201630,1829030,976430,24877650,645314670, %T A385100 3392218830,17041181430 %N A385100 a(n) is the smallest integer k such that A384854(k) = n. %o A385100 (PARI) f(n) = sumdiv(n, d, Mod(-d, n)^d == d); \\ A384854 %o A385100 a(n) = my(k=1); while(f(k) != n, k++); k; \\ _Michel Marcus_, Jun 18 2025 %Y A385100 Cf. A000005, A065295, A384781, A384854, A385499. %K A385100 nonn,more %O A385100 1,2 %A A385100 _Michel Marcus_ and _Juri-Stepan Gerasimov_, Jun 17 2025 %E A385100 a(8)-a(11) from _Michel Marcus_, Jun 18 2025 %E A385100 a(12)-a(14) from _Jinyuan Wang_, Jul 01 2025