Fractional part of 66^(1/3) = 1/25 + 1/807 + 1/1158415 + ... Generated with Perl's Math::BigFloat module. Number of digits in terms is as follows: 2, 3, 7, 13, 25, 50, 100, 199, 397, ...
EXAMPLE
Cube root of 66 = 4.0412400206221902708019900746342621133723098184498...