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Left edge of triangular table A138612.
1

%I #2 Mar 31 2012 13:21:19

%S 1,2,3,5,6,8,9,10,13,14,16,17,18,21,22,24,25,29,30,31,32,34,36,38,40,

%T 41,44,45,47,48,51,54,55,56,58,59,62,63,65,67,69,72,73,74,75,77,80,81,

%U 83,84,87,89,92,94,96,98,99,100,102,103,104,109,110,111,113,116,118

%N Left edge of triangular table A138612.

%F a(n) = A138612(A000124(n-1)).

%K nonn

%O 1,2

%A _Antti Karttunen_, Oct 05 2009