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%I #18 Feb 28 2014 13:07:07
%S 1,3,6,9,12,18,24,27,30,36,42,48,54,60,66,72,78,81,84,90,96,102,108,
%T 114,120,126,132,138,144,150,156,162,168,174,180,186,192,198,204,210,
%U 216,222,228,234,240,243,246,252,258
%N Powers of 3 together with multiples of 6.
%C Union of A000244 and A008588 (without 0).
%C Also, 1 and 3*(even numbers (A005843) UNION powers of 3 (A008588)).
%C Also, numbers m such that m divides A057083(m-1), see the Smyth reference.
%H C. Smyth, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL13/Smyth/smyth2.html">The Terms in Lucas Sequences Divisible by their Indices</a>, Journal of Integer Sequences, Vol.13 (2010), Article 10.2.4.
%o (Sage) def is_in_A231960(n):
%o return 6.divides(n) or n==3^valuation(n,3)
%Y Cf. A029744.
%K nonn
%O 1,2
%A _Thomas M. Bridge_, Nov 15 2013
%E Edited by _Ralf Stephan_, Feb 28 2014