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%I A138838 #5 Mar 14 2020 05:56:47
%S A138838 11,22,8,32,23,33,12,7,8,18,42,42,18,12,27,37,13,8,48,7,13,8,8,13,13,
%T A138838 13,23,12,12,13,17,42,33,12,23,18,33,13,23,32,7,32,8,33,7,43,8
%N A138838 Concatenation of initial and final digits of n-th even superperfect number A061652(n), divided by 2.
%C A138838 Also, concatenation of initial and final digits of n-th superperfect number A019279(n), divided by 2, if there are no odd superperfect numbers.
%C A138838 Also, concatenation of A138124(n) and A138125(n), divided by 2.
%F A138838 a(n) = A138842(n)/2. - _Jinyuan Wang_, Mar 14 2020
%e A138838 a(5)=23 because the 5th even superperfect number A061652(5) is 4096 and the concatenation of initial and final digits of 4096 is 46 and 46/2 = 23.
%Y A138838 Cf. A019279, A061652, A073729, A138124, A138125, A138842.
%K A138838 nonn,base,more
%O A138838 1,1
%A A138838 _Omar E. Pol_, Apr 02 2008
%E A138838 More terms from _Jinyuan Wang_, Mar 14 2020

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