257
This number is a prime.
Just showing those entries submitted by 'Hollesen': (Click here to show all)
257 is a Fermat prime. So is 2*5+7. [Hollesen]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean
This number is a prime.
Just showing those entries submitted by 'Hollesen': (Click here to show all)
257 is a Fermat prime. So is 2*5+7. [Hollesen]