A064539 All...are divisible by 3 but why?

[Ralf Stephan]

> >I mean, what can be more satisfying than putting an %F line... ahm a
> >formula on a previously untouched sequence?
> 	As satisfying to me is putting it into a nice Mathematica 
> 	program. So in essence I have supplied the formula.
> Bob.

C'mon Bob, you surely are more satisfied giving a program like
a(0)=0, a(2n)=a(n), a(2n+1)=a(n)+1
than to convert the number into a binary string and count the ones?



ralf