This number is a composite.

+ 876 = prime(8+7+6) * phi(8+7+6). Note that 876 is the smallest number with this property and there is only two 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 <t5k.org> © G. L. Honaker and Chris K. Caldwell