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a(1)=1. a(n) = the number of terms among (a(1),a(2),...a(n-1)) that either are coprime to n or divide n.
1

%I #7 Mar 11 2014 01:32:41

%S 1,1,2,3,4,4,6,6,6,4,10,10,12,4,8,9,16,8,18,11,14,6,22,16,22,6,19,12,

%T 28,13,30,16,20,8,28,20,36,8,27,21,40,14,42,16,26,10,46,26,42,13,35,

%U 18,52,18,44,22,39,13,58,26,60,14,39,27,49,19,66,22,45,22,70,32,72,19,42,24

%N a(1)=1. a(n) = the number of terms among (a(1),a(2),...a(n-1)) that either are coprime to n or divide n.

%Y A162683

%K nonn

%O 1,3

%A _Leroy Quet_, Jul 10 2009

%E More terms from _Sean A. Irvine_, Nov 03 2009