4421
This number is a prime.
4421 = 1! - 2! + 3! - 4! + 5! - 6! + 7! is prime. [Poo Sung]
The elevation of the summit of Mount Whitney, the highest summit in the contiguous United States, is 4421 meters using a new vertical datum established in 1988 (NAVD88). [Green]
(There are 7 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