79

This number is a prime.

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

Kari Phillips ©2003
+ Each of the numbers 1 to 79 gives a larger number when you write out its English name and add the letters using a=1, b=2, c=3, ... (but 80 gives 74). [Hartley]

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