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 A077812 Squarefree kernel of numbers containing in their decimal representation only the digits 0 and 1. 1

%I #5 Mar 30 2012 18:50:29

%S 1,10,11,10,101,110,111,10,1001,1010,1011,110,1101,1110,1111,10,10001,

%T 10010,10011,1010,10101,10110,10111,110,11001,11010,1001,1110,11101,

%U 11110,11111,10,100001,100010,100011,10010,100101,100110,100111,1010

%N Squarefree kernel of numbers containing in their decimal representation only the digits 0 and 1.

%C Not all squarefree 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 a(n) = A007947(A007088(n)).

%e a(20) = A007947(A007088(20)) = A007947(10100) = A007947(2*2*5*5*101) = 2*5*101 = 1010.

%Y Cf. A077813, A077805, A077806.

%K nonn,base

%O 1,2

%A _Reinhard Zumkeller_, Nov 16 2002

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