Trying to remember the name of a constant

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The discussion revolves around identifying a constant related to the doubling map function f(x) defined on the interval [0,1]. The scenario involves starting with an initial condition x[0] = 1/p, where p is a prime number, and seeks the probability that the orbit of this point has a period of p-1. The approximate value of this probability is noted to be around 0.38. The constant in question is identified as Artin's Constant. This highlights the connection between dynamical systems and number theory.
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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!
 
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