468

This number is a composite.

+ 4-6-8 are the first three composite digits. Note that there is a mean gap of exactly 4 between primes less than the 68th prime. [Honaker]

+ 1*1! + 2*2! + 3*3! + ... + 468*468! is a titanic prime. [Firoozbakht]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell