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%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