It seems the exact value has not been found yet, although it is sure to be very large. The article at http://en.wikipedia.org/wiki/Skewe's_Number shows some upper and lower bounds; perhaps you can some day do more research into this area, and find better bounds - or even the exact value for this number.
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The exact value could never be expressed as a number, as pi is an irrational number. The integer value would be: 31415926535897932384626433832795028841 If you want a slightly more accurate value: 31415926535897932384626433832795028841.9716939937510582097494 If you want an exact value: ∞ (∫e-x² dx)2 × 1038 -∞
3.1429
Approximate value, is a value that is not necessarily the right answer but, it is the closest one to it.It means that it isn't exact - but close to the exact value.
An irrational number cannot be written as a fraction or to an exact decimal such as the symbol for pi or the square root of two. A rational number can be written in the form of a fraction or a decimal to an exact value.
Some value / exact value x 100 = percentage