Fractional part of 81^(1/3) = 1/4 + 1/14 + 1/188 + ... Generated with Perl's Math::BigFloat module. Number of digits in terms is as follows: 1, 2, 3, 7, 13, 25, 50, 100, 199, 399, ...
EXAMPLE
Cube root of 81 = 4.3267487109222251469649149323403287651756077604981...