# Definition:Copeland-Erdős Constant

## Definition

The Copeland-Erdős constant is the real number whose decimal expansion is formed by concatenating the prime numbers in ascending order:

$C_{10} = 0 \cdotp 23571 \, 11317 \, 19232 \, 93137 \, 4143 \ldots$

## Source of Name

This entry was named for Arthur Herbert Copeland.