%I #2 Mar 30 2012 18:51:06
%S 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,22,23,24,25,26,18,19,20,21,
%T 27,28,29,30,31,32,33,34,35,36,37,42,43,44,45,46,38,39,40,41,47,48,49,
%U 50,51,52,53,54,55,56,57,62,63,64,65,66,58,59,60,61,67,68,69,70,71,72
%N A108971(A108971(n)).
%C a(A179979(n)) = A179979(n);
%C A108971(n) = a(A179977(n)) = A179977(a(n)).
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Aug 04 2010