%I
%S 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,
%T 27,28,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,
%U 51,52,53,54,55,56,57,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74
%N Not divisible by 29.
%F From _Chai Wah Wu_, Aug 04 2016: (Start)
%F a(n) = a(n1) + a(n28)  a(n29) for n > 29.
%F G.f.: Sum_{k = 1..29} x^k /(1  x  x^28 + x^29). (End)
%t With[{nn=100},Complement[Range[nn],Range[29,nn,29]]] (* _Harvey P. Dale_, Mar 11 2013 *)
%o (Sage) [i for i in range(0,100) if gcd(29, i) == 1]
%K nonn,easy
%O 1,2
%A _Zerinvary Lajos_, May 18 2009
