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 A074594 #7 Nov 18 2018 09:10:25 %S A074594 2,2,2,2,2,2,2,2,2,2,2,2,3,2,2,2,2,2,2,2,3,2,2,2,2,2,2,2,2,2,2,2,2,3, %T A074594 2,2,2,3,2,2,3,2,2,2,2,2,3,2,2,3,2,2,2,2,3,2,2,2,2,2,2,2,2,2,3,2,3,2, %U A074594 2,3,2,2,3,2,2,2,2,2,3,2,2,2,3,2,3,3,2,2,2,2,3,3,2,2,2,2,2,2,2,2,3,2,2,3,2 %N A074594 Number of distinct prime factors of numbers that are not prime powers. %H A074594 Harvey P. Dale, <a href="/A074594/b074594.txt">Table of n, a(n) for n = 1..1000</a> %F A074594 a(n) = A001221(A024619(n)). %t A074594 PrimeNu/@Select[Range[2,300],!PrimePowerQ[#]&] (* _Harvey P. Dale_, Nov 18 2018 *) %Y A074594 Cf. A074595, A074592, A074593. %K A074594 nonn %O A074594 1,1 %A A074594 _Reinhard Zumkeller_, Aug 25 2002