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%I #3 Mar 30 2012 18:52:33
%S 3,7,37,177,17777,377777,1777777,17777777777,177777777777777777777,
%T 377777777777777777777777777777,377777777777777777777777777777777777,
%U 1777777777777777777777777777777777777777777
%N Mersenne primes written in base 8.
%F a(n) = A007094(A000668(n)).
%Y Cf. A117293.
%K nonn,base
%O 1,1
%A Vladislav-Stepan Malakhovsky & _Juri-Stepan Gerasimov_, Jun 16 2009
%E a(6) and a(10) corrected by _R. J. Mathar_, Aug 03 2009
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