%I #5 Oct 16 2019 01:14:16
%S 1,3,9,27,81,243,729,2187,6561,19683,59049,1594323,4782969,14348907,
%T 43046721,129140163,387420489,10460353203,31381059609,282429536481,
%U 2541865828329,109418989131512359209,30903154382632612361920641803529
%N Numbers of form 3^k (values of k see A050724) containing no pair of consecutive equal digits (probably finite).
%Y Cf. A043096, A050724.
%K nonn,base
%O 0,2
%A _Patrick De Geest_, Sep 15 1999