This number is a composite.

Just showing those entries submitted by 'Honaker': (Click here to show all)

+ 312 is the average of a twin prime pair. Describe 312 to find another, i.e., 312 is 'one 3, one 1, one 2' or 131112. This is the smallest example. [Honaker]

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