%I #7 Sep 16 2018 11:00:48
%S 3,27,75,243,363,675,867,1587,1875,2187,2523,3267,5043,6075,6627,7803,
%T 8427,9075,10443,14283,15123,16875,19683,20667,21675,22707,23763,
%U 29403,30603,34347,38307,39675,43923,45387,46875,51483,54675
%N Odd numbers k such that A166100((k-1)/2)/k is not an integer.
%C Conjecture: a(n) = 3*A166103(n). (Checked for terms a(1)-a(92).)
%H A. Karttunen, <a href="/A166102/b166102.txt">Table of n, a(n) for n = 1..92</a>
%Y a(n) = A005408(A166101(n)). Cf. A166272.
%K nonn
%O 1,1
%A _Antti Karttunen_, Oct 13 2009