1187

This number is a prime.

+ 1187 concatenated with either the previous prime (1181) in order or the next prime (1193) in order is prime. This is the smallest 4-digit number with this property. [Mix]

+ The smallest non-emirp such that the prime factors of its reversal are emirps. [Green]

(There are 4 curios for this number that have not yet been approved by an editor.)

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