643
This number is a prime.
Single Curio View: (Seek other curios for this number)
As Alois P. Heinz discovered, 643 is the smallest nonprime
among integers a(n) greater than 1 so that multiplying the
n-th highly composite number by a(n) will give a highly
composite number. a(643) = 6 is not prime. [Post]
Submitted: 2013-10-25 12:35:06; Last Modified: 2018-12-22 19:30:02.
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell