21

This number is a composite.

Single Curio View:   (Seek other curios for this number)
21 is the smallest number with two prime factors that do not divide 10.

Submitted: 2000-06-01 03:25:22;   Last Modified: 2022-02-10 02:03:18.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell