\begin{definition}[Definition:Copeland-Erdős Constant]
The '''Copeland-Erdős constant''' is the real number whose decimal expansion is formed by concatenating the prime numbers in ascending order:
:$C_{10} = 0 \cdotp 23571 \, 11317 \, 19232 \, 93137 \, 4143 \ldots$
{{OEIS|A033308}}
\end{definition}