What do you mean by "Ln(x)"? There are several polynomial series that fit that nomenclature:

1. Laguerre polynomials
2. Laurent polynomials
3. Littlewood polynomials
4. Legendre polynomials
5. etc

If you mean "ln(x)", then use the transformation rules to go from the log(x) (base 10) to ln(x) (base e).