# 189

This number is a composite.

The product of the four primes in a prime quadruplet (except for 5,7,11,13) always ends in 189. [Rupinski]

The 189th century would be the first to contain as few as five prime years (18803, 18839, 18859, 18869 and 18899).

(There are 2 curios for this number that have not yet been approved by an editor.)

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