697

This number is a composite.

+ The only known integer which is both a 12-hyperperfect number and a brilliant number. [Post]

+ The smallest brilliant number n for which the sum of the first n brilliant numbers is a brilliant number. Note that Colorado is actually a hexahectaenneacontakaiheptagon, meaning it has 697 sides. [Gaydos]

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