%I A077813
%S A077813 1,10,11,101,110,111,1001,1010,1011,1101,1110,1111,10001,10010,10011,
%T A077813 10101,10110,10111,11001,11010,11101,11110,11111,100001,100010,100011,
%U A077813 100101,100110,100111,101001,101010,101011,101101,101110,101111,110001
%N A077813 Square-free numbers containing in their decimal representation only the 
               digits 0 and 1.
%e A077813 a(51) = 1000110 = 2*3*5*17*37*53.
%Y A077813 Cf. A077812, A020449, A005117.
%Y A077813 Sequence in context: A066330 A125099 A055611 this_sequence A104326 A037090 
               A118240
%Y A077813 Adjacent sequences: A077810 A077811 A077812 this_sequence A077814 A077815 
               A077816
%K A077813 nonn,base
%O A077813 1,2
%A A077813 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 16 2002