Specifically, if pi contains itself, that means "pi - pi/b^k" is a terminating fraction N in base b", where b is your choice of base (like base 10), and k is some positive integer. So
pi = N/(1-b^k) which is rational.
(And if you set k=0, you get that pi "contains itself" in the sense that pi from the 1st digit onward is of course pi)
pi = N/(1-b^k) which is rational.
(And if you set k=0, you get that pi "contains itself" in the sense that pi from the 1st digit onward is of course pi)