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 A361967 #15 Dec 24 2024 07:30:16
%S A361967 2,2,1,2,0,3,1,4,0,2,0,5,0,1,1,2,0,3,0,2,0,2,0,8,0,2,0,3,0,4,1,4,0,0,
%T A361967 0,6,0,0,0,4,0,3,0,2,0,2,0,11,0,0,0,2,0,1,0,4,0,2,0,8,0,1,1,2,0,3,0,0,
%U A361967 0,3,0,11,0,0,0,0,0,3,0,8,0,2,0,5,0,0,0
%N A361967 Number of numbers k such that uphi(k) = n, where uphi is the unitary totient function (A047994).
%H A361967 Amiram Eldar, <a href="/A361967/b361967.txt">Table of n, a(n) for n = 1..10000</a>
%F A361967 a(A347771(n)) = 0.
%F A361967 a(A361969(n)) = 1.
%F A361967 a(A361970(n)) = n.
%F A361967 Asymptotic mean: Limit_{m->oo} (1/m) * Sum_{k=1..m} a(k) = A327837. - _Amiram Eldar_, Dec 24 2024
%t A361967 a[n_] := Length[invUPhi[n]]; Array[a, 100] (* using the function invUPhi from A361966 *)
%Y A361967 Row lengths of A361966.
%Y A361967 The unitary version of A014197.
%Y A361967 Cf. A047994, A135347, A327837, A347771 (positions of 0's), A361966, A361968 (indices of records), A361969 (positions of 1's), A361970, A361971 (record values).
%K A361967 nonn
%O A361967 1,1
%A A361967 _Amiram Eldar_, Apr 01 2023