This number is a composite.
The 99th prime plus (9+9) is the next prime.
99 = π( prime(9)*prime(9) ). Note that 99 is the only two-digit number with this property. [Firoozbakht]
99!/π(99)! + 1 is prime. [Firoozbakht]
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell