Trying to remember the name of a constant

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Deadstar
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Hey folks I'm trying to remember the name of this constant my lecturer mentioned.

Here's the scenario.

Take the doubling map.

f: [0,1] -> [0,1]

f(x) = 2x if x <= 1/2

2x - 1 if 1/2 < x <= 1.

Now start with an initial condition, x[0] = 1/p where p is a prime number.

What is the probability that the orbit starting with this point is of period p-1?

The answer is roughly 0.38... but I forget what this constant is called.
 
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I believe that would be Artin's Constant.
 
vr88 said:
I believe that would be Artin's Constant.

Great thanks for that!