%I

%S 0,1,2,3,4,5,7,8,9,10,12,17,27

%N Decimal expansion of 7^n contains no pair of consecutive equal digits (probably finite).

%e 7^27 = 65712362363534280139543.

%Y Cf. A030703, A046265, A046273.

%K nonn,base

%O 0,3

%A _Patrick De Geest_, Sep 15 1999