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 A290304 #13 Nov 10 2021 07:07:23
%S A290304 1,12,24,120,96,180,432,744,720,864,840,1200,1260,1680,2520,1728,2784,
%T A290304 2880,3744,4032,5040,2592,4224,5040,5760,11520,11880,9216,18000,20160,
%U A290304 17280,12480,17280,20160,28080,20160,23040,21600,32256,30240,52080,34560,57600
%N A290304 Values of uphi(k) = uphi(k+1).
%C A290304 The values of unitary totient function of numbers such that k and k+1 have the same value.
%C A290304 The unitary version of A003275.
%H A290304 Amiram Eldar, <a href="/A290304/b290304.txt">Table of n, a(n) for n = 1..2198</a>
%F A290304 a(n) = A047994(A287055(n)).
%t A290304 uphi[n_] := If[n==1, 1, (Times @@ (Table[#[[1]]^#[[2]] - 1, {1}] & /@ FactorInteger[n]))[[1]]]; a={}; u1=0; For[k=0, k<10^5, k++; u2=uphi[k]; If[u1==u2, a = AppendTo[a, u1]]; u1=u2]; a
%Y A290304 Cf. A001274, A003275, A047994, A287055.
%K A290304 nonn
%O A290304 1,2
%A A290304 _Amiram Eldar_, Jul 26 2017