2371
This number is a prime.
The largest known number n such that 100^n-99^n is prime (as of November 2009). [Hassler]
The smallest prime formed from two double-digit
right-truncatable primes. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell