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Re: Pi is not a real number?

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  • Subject: [mg86643] Re: Pi is not a real number?
  • From: Szabolcs Horvát <szhorvat at>
  • Date: Sat, 15 Mar 2008 17:45:27 -0500 (EST)
  • Organization: University of Bergen
  • References: <frg0e4$f05$>

Sebastian Meznaric wrote:
> Try this in Mathematica
> RealDigits[\[Pi], 10, 3, -10^9]
> The answer you get:
> RealDigits::realx: The value \[Pi] is not a real number. >>
> I am using 6.0.0.

That's right, in Mathematica Pi is not a "number", but a "symbol". 
Head[Pi] === Symbol and Head[3.14] === Real.  The digits of Pi must be 
explicitly calculated using N[Pi, 100 (* number of digits)* ] before 
RealDigits can be used on it.  But most probably you will not be able to 
use Mathematica to calculate 10^9 digits of Pi (unless you have a huge 
amount of memory).  Instead, I suggest using a specialized program or an 
online database such as

Also see this thread:

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