This number is a prime.
In base 28 (A=10, B=11... R=27) RIB is prime; the smallest possible base for a prime RIB. [Rupinski]
(There is one curio for this number that has not yet been approved by an editor.)
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell