%I A077812
%S A077812 1,10,11,10,101,110,111,10,1001,1010,1011,110,1101,1110,1111,10,10001,
%T A077812 10010,10011,1010,10101,10110,10111,110,11001,11010,1001,1110,11101,
%U A077812 11110,11111,10,100001,100010,100011,10010,100101,100110,100111,1010
%N A077812 Square-free kernel of numbers containing in their decimal representation 
               only the digits 0 and 1.
%C A077812 Not all square-free kernels of numbers containing in their decimal representation 
               only the digits 0 and 1 also have this property: a(511) = A007947(A007088(511)) 
               = A007947(111111111) = A007947(3*3*37*333667) = 3*37*333667 = 37037037.
%F A077812 a(n) = A007947(A007088(n)).
%e A077812 a(20) = A007947(A007088(20)) = A007947(10100) = A007947(2*2*5*5*101) 
               = 2*5*101 = 1010.
%Y A077812 Cf. A077813, A077805, A077806.
%Y A077812 Sequence in context: A085214 A082492 A004053 this_sequence A004288 A065016 
               A087381
%Y A077812 Adjacent sequences: A077809 A077810 A077811 this_sequence A077813 A077814 
               A077815
%K A077812 nonn,base
%O A077812 1,2
%A A077812 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 16 2002