5021
This number is a prime.
(5021, 5563) is the first case of a pair of primes that are both adjacent to a pair of amicable numbers, i.e., (5020, 5564). [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell