261
This number is a composite.
Just showing those entries submitted by 'Wu': (Click here to show all)
The only 3-digit number n in which 2n - n is prime. [Wu]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a composite.
Just showing those entries submitted by 'Wu': (Click here to show all)
The only 3-digit number n in which 2n - n is prime. [Wu]