656601
This number is a composite.
656601 is the smallest Smith number which is also a Carmichael number. [Gupta]
656601 is the smallest Carmichael number n surrounded by a
prime triplet (n-4, n-2, n+2 are all primes). [Yosei]
The smallest integer pseudoprime to base-5 that is the
midpoint of a cousin prime pair {656599, 656603}. [Bajpai]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell