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Digit Frequencies in the Copeland-Erdos Constant

​
number of primes
16
base
10
In base 10, the Copeland–Erdos constant 0.23571113171923… is obtained by concatenating the digits of the primes 2, 3, 5, … . Copeland and Erdos proved that this constant is normal in base 10, meaning that in the limit the frequency of each digit is
1
10
, the frequency of each block of two digits is
1
100
, and so on. The sizes of the pie chart slices show the frequencies of single digits for a given approximation. As more primes are used the slices become more nearly equal, reflecting the constant's statistical normality. No proof of normality is known for this number in other bases.
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