Fractional part of 85^(1/3) = 1/3 + 1/16 + 1/1004 + ... Generated with Perl's Math::BigFloat module. Number of digits in terms is as follows: 1, 2, 4, 7, 14, 27, 54, 107, 214, 428, ...
EXAMPLE
Cube root of 85 = 4.3968296721581792758092107925384418605988837540866...