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 A362485 #11 Apr 22 2023 11:38:56 %S A362485 2,2,2,2,0,4,0,4,0,2,0,6,0,0,2,4,0,4,0,2,0,2,0,10,0,0,0,2,0,6,0,4,0,0, %T A362485 0,8,0,0,0,4,0,2,0,2,2,2,0,14,0,0,0,2,0,2,0,2,0,2,0,10,0,0,0,4,0,4,0, %U A362485 0,0,2,0,14,0,0,0,0,0,2,0,8,0,2,0,4,0,0 %N A362485 Number of numbers k such that iphi(k) = n, where iphi is the infinitary totient function A091732. %C A362485 a(n) is even for all n, because if k is a solution to iphi(k) = n, and A007814(k) is even, then 2*k is also a solution, i.e., iphi(2*k) = n. %H A362485 Amiram Eldar, <a href="/A362485/b362485.txt">Table of n, a(n) for n = 1..10000</a> %F A362485 a(A362486(n)) = 0. %t A362485 a[n_] := Length[invIPhi[n]]; Array[a, 100] (* using the function invIPhi from A362484 *) %Y A362485 Row lengths of A362484. %Y A362485 Cf. A007814, A091732, A362486 (positions of 0's), A362487 (indices of records). %Y A362485 Similar sequences: A014197, A063740, A361967, A362181. %K A362485 nonn %O A362485 1,1 %A A362485 _Amiram Eldar_, Apr 22 2023