This number is a prime.

+ The largest distinct-odd-digit Ormiston prime containing all of the odd digits. Note that it is also a deletable prime (75931, 7591, 751, 71, 7). [Loungrides]

+ The largest Ulam number that consists of all of the distinct odd digits. [Loungrides]

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