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 A094469 #20 Jan 08 2025 17:02:19
%S A094469 1,2,3,6,1645,3290,4935,9870,3831674,11495022,346014339,692028678
%N A094469 Numbers k such that sum of 11th powers of divisors of k is divisible by the square of Euler-phi of k.
%F A094469 A013959(k)/A000010(k)^2 is an integer.
%t A094469 Do[ If[ Mod[ DivisorSigma[11, n], EulerPhi[n]^2] == 0, Print[n]], {n, 10^7}] (* _Robert G. Wilson v_, May 23 2004 *)
%o A094469 (PARI) isok(k) = (sigma(k, 11) % eulerphi(k)^2) == 0; \\ _Michel Marcus_, Mar 07 2020
%Y A094469 Cf. A000010, A013959, A015763, A091285.
%K A094469 nonn,more
%O A094469 1,2
%A A094469 _Labos Elemer_, May 19 2004
%E A094469 a(9) from _Robert G. Wilson v_, May 23 2004
%E A094469 a(10) from _Labos Elemer_, May 26 2004
%E A094469 a(6) corrected and a(11)-a(12) added by _Amiram Eldar_, Mar 07 2020