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 A087227 #10 Aug 28 2019 04:47:40
%S A087227 0,1,3,1,2,3,6,1,7,2,5,3,3,6,6,1,4,7,7,2,3,5,5,3,7,3,37,6,6,6,35,1,8,
%T A087227 4,4,7,7,7,12,2,36,3,8,5,5,5,35,3,7,7,8,3,3,37,35,6,10,6,11,6,6,35,36,
%U A087227 1,7,8,9,4,5,4,34,7,36,7,5,7,7,12,12,2,7,36,35,3,3,8,11,5,10,5,32,5,6,35,35
%N A087227 Number of distinct prime factors of A087226(n), the LCM of terms in trajectory of 3x+1 (function) initiated at n.
%C A087227 This sequence differs from A078719: a(n) <= (number of odd terms in list).
%e A087227 n=25: A087226(25) = 535792400 with factor-set={2,5,11,13,17,19,29} so a(25)=7, while number of odd terms in the trajectory is A078219(25)=8.
%Y A087227 Cf. A006370, A087226, A078719.
%K A087227 nonn
%O A087227 1,3
%A A087227 _Labos Elemer_, Aug 28 2003