# 13579...97531 (28-digits)

This number is a prime.

13579111 3151719171 5131197531

A prime formed from the concatenation in ascending order of the odd numbers 1 through 19 and continuing from 19 in descending order up to 1. Can you find a larger prime of this form? [Loungrides]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell