75
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 
Participate:
We will be upgrading the server this Friday (May 9) and this site will be down at
times on that day (and possibly the next).   (caldwell@utm.edu)

275 + 75 is prime. [Luhn]

75 is the smallest non-prime deficient number whose sum as well as product of aliquot divisors is a perfect square. [Gupta]




Prime Curios! © 1999-2008 (all rights reserved)