13579...13579 (61-digits)

This number is a prime.

         1 3579753135 7975313579 7531357975 3135797531 3579753135 7975313579

+ A prime number obtained by "undulating" the first odd digits. It is the smallest such prime except for the obvious 13. [Gallardo]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell