7577
This number is a prime.
The smallest emirp consisting of a pair of successive
composite odd numbers (75, 77). [Beedassy]
7577 is a Pythagorean emirp. Interestingly, the product of
the digits plus the sum of digits of 7577 is also an emirp! [Anitha]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean