This number is a prime.

Single Curio View:   (Seek other curios for this number)
Replacing each digit d of 641 with d copies of the digit d produces another prime, i.e., 641 becomes 66666644441, which is also prime. If we apply the same transform using 66666644441, yet another prime is formed. [Honaker]

Submitted: 1999-09-22 20:12:53;   Last Modified: 2009-03-04 19:01:06.
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell