# Is there a formula that generates a completely random number? [closed]

I'm searching for a formula that can generate a completely random number ($(-\infty,\infty)$) or defined by parts ($[n_0,n]$).

I'm not worth with a pseudorandom number generator formula. I'm searching a totally random number generator formula.

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Awesome. What's your definition of "completely/totally random"? –  anon Mar 21 '12 at 22:27
A deterministic formula to generate a random number is a contradiction in terms. –  user7530 Mar 21 '12 at 22:27
Predicted by what? | Edit: Wouldn't using the formula itself amount to a valid prediction of its outcome? –  anon Mar 21 '12 at 22:33
Here is my favorite random number generator: $f:\mathbb{R}\to\mathbb{R}$ defined by $f(x)=9$. –  Bill Cook Mar 21 '12 at 23:01
@BillCook: I prefer the xkcd algorithm. –  Dan Mar 21 '12 at 23:03