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%I #17 Mar 13 2019 13:06:08
%S 1,2,3,5,6,9,14,15,18,27,41,42,45,54,81,122,123,126,135,162,243,365,
%T 366,369,378,405,486,729,1094,1095,1098,1107,1134,1215,1458,2187
%N The terms of A055235 (sums of two powers of 3) divided by 2.
%C n such that 3 is the largest power of 3 dividing binomial(3n,n). - _Benoit Cloitre_, Jan 01 2004
%C Equals A023745 + 1.
%C This sequence is A007051 together with its (successive) multiples by (powers of) 3. - _R. K. Guy_, Oct 08 2011
%H C. Armana, <a href="https://doi.org/10.1016/j.jnt.2011.02.011">Coefficients of Drinfeld modular forms and Hecke operators</a>, Journal of Number Theory 131 (2011), 1435-1460.
%F (3^n + 3^m) / 2, n = 0, 1, 2, 3 ..., m = 0, 1, 2, 3, ... n.
%e a(4) = 5 = (3^2+3^0) / 2.
%Y Cf. A055235, A007051, A023745.
%K easy,nonn
%O 1,2
%A _Jeremy Gardiner_, Jul 21 2002
%E Edited by _Jeremy Gardiner_, Oct 08 2011
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