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

1, 10, 11, 10, 101, 110, 111, 10, 1001, 1010, 1011, 110, 1101, 1110, 1111, 10, 10001, 10010, 10011, 1010, 10101, 10110, 10111, 110, 11001, 11010, 1001, 1110, 11101, 11110, 11111, 10, 100001, 100010, 100011, 10010, 100101, 100110, 100111, 1010

Offset

1,2

Comments

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.

Links

Table of n, a(n) for n=1..40.

Formula

a(n) = A007947(A007088(n)).

Example

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

Crossrefs

Cf. A077813, A077805, A077806.

Sequence in context: A085214 A082492 A004053 * A004288 A065016 A087381

Adjacent sequences: A077809 A077810 A077811 * A077813 A077814 A077815

Keyword

nonn,base

Author

Reinhard Zumkeller, Nov 16 2002

Status

approved