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Pi (π) [aka Archimedes' constant] is a mathimatical constant that can be defined as the ratio of a circle’s circumference to its diameter.

Pi is an irrational number and therefore cannot be written as the ratio of two integers. It is also a transindental meaning there is no polynomial with integer (or rational) coefficients of which pi is a root.

The pi size record is 1.2 x 10¹² (> 1,240,000,000,000) digits, obtained by Kanada and his team in December 2002.

Below are a sample of the digits of pi leading up to the 25 billionth.

3.
1415926535 8979323846 2643383279 5028841971 6939937510 : 50 
5820974944 5923078164 0628620899 8628034825 3421170679 : 100 
[...]
2448547079 5329693979 7145627081 9204187454 9483487803 : 24999999950
1309759846 5364560010 7388984278 8403481193 9913806533 : 25000000000

Rersources:

• Pi (π) calculated to 1 million places
• Archive of Pi (π) calculated to 10 million places [mirror] SHA1 MD5
• Archive of Pi (π) calculated to 100 million places [mirror] SHA1 MD5
• Statistics about the first 1.2 trillion digits of Pi [super-computing.org]
• Pi history [www-gap.dcs.st-and.ac.uk]
• PlanetMath: pi [planetmath.org]
• The open source project for calculating Pi. [sourceforge.net]
• Math Forum: Finding the Value of Pi [mathforum.org]