# 4

This number is a composite.

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

4 is the largest number m such that prime(m) = sigma(m). [Firoozbakht]

The only known number n such that prime(n)^prime(n) - π(n) is prime. [Firoozbakht]

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