This site will be down for maintenance beginning noon CDT (5pm UTC) Wed April 14
This number is a unit (so is neither prime nor composite).
Just showing those entries submitted by 'Gupta': (Click here to show all)
π(1) = !1, where !1 denotes subfactorial 1. [Gupta]
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell