%N a(1)=1. a(n) = n-th integer from among those positive integers which do not occur earlier in the sequence and which are not coprime to n.
%e 2,3,6,8,12,14,15,16,...is the sequence of positive integers which do not occur among the first 5 terms of the sequence and which are not coprime to 6. 14 is the 6th of these integers, so a(6) = 14.
%Y Cf. A105054.
%A _Leroy Quet_, Aug 20 2006
%E Extended by _Ray Chandler_, Aug 22 2006