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Numbers of form 9^k (values of k see A050730) containing no pair of consecutive equal digits (probably finite).
0

%I #5 Oct 16 2019 01:12:33

%S 1,9,81,729,6561,59049,4782969,43046721,387420489,31381059609,

%T 282429536481,2541865828329,109418989131512359209,

%U 30903154382632612361920641803529

%N Numbers of form 9^k (values of k see A050730) containing no pair of consecutive equal digits (probably finite).

%Y Cf. A043096, A050730.

%K nonn,base

%O 0,2

%A _Patrick De Geest_, Sep 15 1999