%I A055559
%S A055559 29,2999,2999999,29999999,29999999999999999999,
%T A055559 2999999999999999999999999999,
%U A055559 29999999999999999999999999999999999999999999
%N A055559 Primes of form 2999...999.
%F A055559 a(n)=3*10^n-1 and is prime
%e A055559 3*10^n-1 is prime for {1,3,6,7,19,27,43,55,207} n gives how many digit 
               9 occurs in these numbers
%Y A055559 Cf. A051200.
%Y A055559 Sequence in context: A084223 A138755 A091751 this_sequence A144233 A125074 
               A033519
%Y A055559 Adjacent sequences: A055556 A055557 A055558 this_sequence A055560 A055561 
               A055562
%K A055559 base,nonn
%O A055559 1,1
%A A055559 Labos E. (labos(AT)ana.sote.hu), Jul 10 2000