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 A072699 #7 Nov 14 2019 09:41:11 %S A072699 1,1,1,1,1,1,2,1,1,2,1,1,1,2,2,1,2,1,3,1,1,2,1,2,2,1,1,2,1,2,1,1,2,3, %T A072699 1,1,2,2,1,2,2,2,1,1,1,3,1,1,3,2,1,3,2,2,2,1,2,1,2,1,1,2,2,2,1,1,2,1, %U A072699 2,2,1,1,3,1,2,1,1,2,2,3,2,1,1,3,1,1,2,2,2,2,1,2,2,2,2,2,3,1,1,1,3,3,1,2,2 %N A072699 Number of prime factors of A072697(n). %C A072699 a(n) = A001222(A072697(n)) = A001221(A072697(n)). %H A072699 Amiram Eldar, <a href="/A072699/b072699.txt">Table of n, a(n) for n = 1..10000</a> %e A072699 a(19) = A001222(A072697(19)) = A001222(42) = A001222(2*3*7) = 3. %Y A072699 Cf. A072698, A072700. %K A072699 nonn %O A072699 1,7 %A A072699 _Reinhard Zumkeller_, Jul 04 2002