12121
This number is a composite.
The smallest palindrome with three prime factors, with none of them being palindromes themselves (12121 = 17 x 23 x 31). [Thoms]
(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