9749
This number is a prime.
The yellow Union Pacific locomotive No. 9749 is parked on the tracks off Stanley Blvd., between Livermore and Pleasanton, California (6 August 2002). Note that 9749 is prime! [Haga]
The only 4-digit emirp that can be represented as sum of three consecutive double-digit squares, i.e., 56^2+57^2+58^2. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell