# 72

This number is a composite.

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

If we use 3 instead of 2 in the formula for perfect numbers we get
3^{2}(3^{2} - 1) = 72, which lies between a twin prime pair. [Gundrum]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell