122333221
This number is a prime.
A palindromic prime that begins with one 1, two 2's, and three 3's, when read left-to-right or right-to-left. [Murthy]
(There are 3 curios for this number that have not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell