%I A131552
%S A131552 4,19,93,334,841,3404,7271,7720,44152,406774
%N A131552 Least power of 3 having exactly n consecutive 1's in its decimal representation.
%e A131552 a(3)=93 because 3^93(i.e. 235655016338368235499067731945871638181119123) 
               is the smallest power of 3 to contain a run of 3 consecutive ones 
               in its decimal form.
%t A131552 a = ""; Do[ a = StringJoin[a, "1"]; b = StringJoin[a, "1"]; k = 1; While[ 
               StringPosition[ ToString[3^k], a] == {} || StringPosition[ ToString[3^k], 
               b] != {}, k++ ]; Print[k], {n, 1, 10} ]
%Y A131552 Sequence in context: A004253 A151253 A121179 this_sequence A122369 A005978 
               A083065
%Y A131552 Adjacent sequences: A131549 A131550 A131551 this_sequence A131553 A131554 
               A131555
%K A131552 more,nonn,base
%O A131552 1,1
%A A131552 Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 26 2007