The On-Line Encyclopedia of Integer Sequences (OEIS)

http://oeis.org/

Some new links...

http://en.wikipedia.org/wiki/Kelly_criterion

The original manuscript written by J.L. Kelly, Jr. in 1956, "A New Interpretation of Information Rate"
http://www.racing.saratoga.ny.us/kelly.pdf


http://en.wikipedia.org/wiki/St._Petersburg_paradox

SymPy: A Python library for symbolic mathematics
http://en.wikipedia.org/wiki/Sympy
http://sympy.org/
http://code.google.com/p/sympy/
http://planet.sympy.org/

mpmath: Python library for arbitrary-precision floating-point arithmetic
http://code.google.com/p/mpmath/

Sage: Open Source Mathematics Software
http://sagemath.org/