Pi and Other Constants:

Online Papers:

The following papers concerning computation of various familiar transcendentals are available in pdf. Paper P123 details how to compute, among other things, individual binary digits of Pi. Fortran code for this is available below. The first paper is an expanded HTML version of P40.

Ramanujan, Modular Equations, and Approximations to Pi or How to compute One Billion Digits of Pi

P159: The amazing number pi
P130: The quest for pi
P123: On the rapid computation of various polylogarithmic constants
P117: An efficient algorithm for the Riemann zeta function
P109: Orthogonality and irrationality
P83: Some cubic modular identities of Ramanujan
P40: Ramanujan, modular equations, and approximations to pi

Fortran code for computing Hex digits of Pi as in P123
Buy my book : Pi and the AGM: Wiley, 1987

Other Links:

Pi Pages
Try the Inverse Symbolic Calculator
Constants, Digits of Pi and other Miscellany