705

This number is a composite.

+ 705 = π(7!) + π(0!) + π(5!). Note that 705 is the only multi-digit number with this property. [Firoozbakht]

(There are 2 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