21

This number is a composite.

Single Curio View:   (Seek other curios for this number)
The smallest prime of the form n21 + 21 begins with a decimal expansion of π = 3.141....

Submitted: 2000-05-31 22:25:22;   Last Modified: 2008-01-30 11:28:00.
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell