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 A091837 Smallest b>1 such that 11*n is a repdigit in base b. 0

%I

%S 10,10,10,10,10,10,10,10,10,21,3,21,12,13,14,15,16,17,18,19,20,3,22,

%T 21,24,21,26,21,28,21,4,21,32,21,34,21,36,21,32,21,40,32,42,43,32,45,

%U 46,23,48,24,32,25,52,26,54,27,32,28,58,29,60,4,32,31,54,32,66,33,32

%N Smallest b>1 such that 11*n is a repdigit in base b.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Repdigit.html">Repdigit</a>

%e n=11: 121=11*11 in binary = '1111001', but in ternary = '11111',

%e therefore a(11)=3;

%e n=93: 1023=11*93 in binary = '1111111111', therefore a(93)=2.

%Y Cf. A008593.

%K nonn,base

%O 1,1

%A _Reinhard Zumkeller_, Mar 10 2004

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Last modified May 22 14:32 EDT 2019. Contains 323480 sequences. (Running on oeis4.)