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 A095139 #2 Mar 30 2012 17:31:01
%S A095139 1,0,1,1,1,1,1,2,2,2,2,2,2,3,3,3,1,2,2,2,2,1,2,3,1,2,2,3,1,2,3,2,2,1,
%T A095139 2,2,2,6,2,1,3,4,5,2,5,3,2,3,3,3,3,2,4,3,4,5,6,1,3,2,4,2,2,4,3,2,3,6,
%U A095139 4,6,4,3
%N A095139 Number of distinct prime factors of A095137(n).
%t A095139 PrimeFactors[n_] := Flatten[ Table[ #[[1]], {1} ] & /@ FactorInteger[n]]; f[n_] := Abs[ Product[ Prime[i], {i, 2, n, 2}] + Product[ Prime[i], {i, 1, n, 2}]]; f[1] = 2; Table[ Length[ PrimeFactors[ f[n]]], {n, 72}]
%Y A095139 Cf. A095137.
%K A095139 nonn
%O A095139 1,8
%A A095139 _Robert G. Wilson v_, May 28 2004