This number is a prime.

+ (23827, 82723) is the only pair of primes concatenated in ascending and descending order from a double-digit prime p and the prime q formed from the cubes of the digits of p, i.e., p=23. [Loungrides]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell