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 A176187 #6 Jul 22 2025 07:57:19
%S A176187 1,1,1,1,1,1,1,1,1,3,1,1,1,3,3,1,1,1,3,1,1,3,1,1,3,1,1,1,3,1,3,1,1,3,
%T A176187 1,1,3,1,3,1,3,1,1,3,1,1,1,3,1,3,3,1,1,1,3,3,3,1,1,3,3,1,3,1,3,1,3,3,
%U A176187 1,3,1,3,3,1,1,1,3
%N A176187 Least period of sequence {f^(m)(n)},m=1,2,3,..., where f^(m) is the m-th iteration of A002326 (f^(1)=f), after possibly dropping some finite number of iterations.
%C A176187 Conjecture: For every n>=0 the sequence {f^(m)(n)} is eventually periodic. Further calculations may show if there exist terms different from 1 and 3.
%e A176187 For n=0, we have: f(0)=1, f(1)=2, f(2)=4, f(4)=6, f(6)=12, f(12)=20, f(20)=20,... Thus a(1)=1.
%Y A176187 Cf. A002326
%K A176187 nonn
%O A176187 0,10
%A A176187 _Vladimir Shevelev_, Apr 11 2010, Apr 20 2010