This number is a composite.
8911 is the only Carmichael number of the form 4n-1 less
than 1,000,000 [Homewood]
8911 is the first Carmichael number with a prime index that is also a Sphenic number with a prime index. [Homewood]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell