login
A077812
Squarefree kernel of numbers containing in their decimal representation only the digits 0 and 1.
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.
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
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Nov 16 2002
STATUS
approved