%I #7 Sep 25 2015 05:13:50

%S 0,0,0,0,1,1,1,2,2,3,3,4,4,4,5,5,6,6,7,7,8,8,9,9,10,11,11,11,12,12,14,

%T 14,15,15,16,16,17,18,18,19,19,20,21,21,21,22,23,24,25,25,25,26,26,27,

%U 28,29,29,30,30,31,31,32,34,34,34,35,36,37,38,38,39,39,40,41,42,42,43,44,44,45

%N a(n) = floor(prime(n)/9).

%C 13, 33, 52, 59, 69, 86, 96, 99, 106 etc. are not in the sequence.

%F a(n) = (A000040(n) - A038194(n))/9 .

%o (PARI) a(n) = prime(n)\9; \\ _Michel Marcus_, Sep 25 2015

%Y Cf. A000040, A038194.

%K nonn,easy

%O 1,8

%A _Paul Curtz_, Jan 22 2009

%E Edited and extended by _R. J. Mathar_, Feb 27 2009