285
This number is a composite.
285 of the 295 primes less than 100000 which are congruent to 23 (mod 120) are full period primes. [Yates]
The smallest number whose sum of distinct prime factors is
an odd prime to the power of an odd prime: 285 = 3 * 5 * 19
and 3 + 5 + 19 = 27 = 3^3. [Post]
(There are 2 curios for this number that have not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell