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Odd numbers k such that A166100((k-1)/2)/k is not an integer.
4

%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