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 A055930 #12 Sep 28 2017 06:04:58
%S A055930 0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9,10,10,11,11,11,12,13,14,15,15,15,16,
%T A055930 16,16,18,18,19,19,21,21,21,22,23,23,24,24,24,24,25,25,27,29,30,30,30,
%U A055930 30,30,30,31,32,32,32,33,34,34,34,36,36,36,37,38,39,40,40,40,41,42,42
%N A055930 Number of distinct prime factors of totient of (n-th prime)!.
%H A055930 G. C. Greubel, <a href="/A055930/b055930.txt">Table of n, a(n) for n = 1..1000</a>
%F A055930 a(n) = A001221(A055929(n)).
%t A055930 Table[PrimeNu[EulerPhi[Prime[n]!]], {n, 1, 50}] (* _G. C. Greubel_, May 13 2017 *)
%o A055930 (PARI) for(n=1,50, print1(omega(eulerphi(prime(n)!)) , ", ")) \\ _G. C. Greubel_, May 13 2017
%Y A055930 Cf. A001221, A039716.
%K A055930 nonn
%O A055930 1,4
%A A055930 _Labos Elemer_, Jul 17 2000