%I A135727
%S A135727 0,2,2,8,4,20,8,20,8,56,20,32,12,56,20,44,16,272,56,56,20,272,32,272,24,
%T A135727 272,56,80,28,128,44,272,32,488,272,104,56,272,56,128,40,272,272,128,44,
%U A135727 272,272,140,48,488,272
%N A135727 Maximal value in orbit of n under the map A001281(x)=3x-1 if x odd, x/
               2 if x even.
%C A135727 On the set of positive integers, the orbit of any number under A001281 
               seems to end in the orbit of 2, of 20 or of 272, which are the respective 
               maxima of these cycles. Since any odd number increases under the 
               map A001281, all elements of this sequence are even.
%o A135727 (PARI) A135727(n)=local(m=n);if(n, while( n != 272 & n != 20 & n != 2, 
               if( n%2, n=3*n-1; m=max(n,m), n>>=1)));m
%Y A135727 Cf. A001281, A037084, A039500-A039505, A135728-A135730. A006370, A006577.
%Y A135727 Sequence in context: A143625 A003612 A103839 this_sequence A075101 A075103 
               A021818
%Y A135727 Adjacent sequences: A135724 A135725 A135726 this_sequence A135728 A135729 
               A135730
%K A135727 nonn
%O A135727 0,2
%A A135727 M. F. Hasler (Maximilian.Hasler(AT)gmail.com), Nov 26 2007