User blog comment:Cloudy176/Goodstein sequence G(4)/@comment-5029411-20131223024832

G(5)

X^X+1, 2

X^X, 3

3X^3+3X^2+3X+3, 4

3X^3+3X^2+3X, 7

3X^3+3X^2+2X, 15

3X^3+3X^2, 63, f(n-1) = n*2^n-1

3X^3+2X^2+63X+63, 64

3X^3+2X^2, 64x2^64-1 = f(63)

3X^3, f(f(f(63)))