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%I #2 Mar 30 2012 17:33:54
%S 33,14,23,44,18,43,9,14,13,8,9,9,13,9,29,9,48,18,8,24,8,28,18,48,8,43,
%T 18,9,9,8,14,9,43,44,18,8,43,48,23
%N Concatenation of initial and final digits of n-th perfect number, divided by 2.
%C Also, concatenation of A135617(n) and A094540(n), divided by 2.
%e a(5)=18 because the 5th perfect number A000396(5) is 33550336 and the concatenation of initial and final digits of 33550336 is 36 and 36/2 = 18.
%Y Cf. A000396, A073729, A135617, A094540, A138843.
%K base,easy,nonn
%O 1,1
%A _Omar E. Pol_, Apr 02 2008
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