21011
This number is a prime.
21011 and 21013 are the smallest pair of consecutive Cyclops primes that have a Cyclops sum (42024) and a Cyclops product (441504143). Note that {21011, 21013} are also a twin prime pair. [Gaydos]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell