This number is a unit (so is neither prime nor composite).

Single Curio View:   (Seek other curios for this number)
The only number whose concatenation with itself can yield primes in many cases. [Murthy]

Submitted: 2002-02-12 20:21:56;   Last Modified: 2008-01-30 17:28:00.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell