171

This number is a composite.

+ 10171 - 171 is prime. [Broadhurst and Titanix]

+ π(1)!*π(2)!*π(3)!*...*π(171)! - 1 is a 3857-digit prime. [Firoozbakht]

(There are 5 curios for this number that have not yet been approved by an editor.)

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