51929597989
This number is a prime.
5 1929597989
The only prime formed from a digit d followed from the concatenation in order of all the double-digit primes that end with 9 (case d=5). [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