3 Mar
2015
3 Mar
'15
1:17 p.m.
On Tue, Mar 3, 2015 at 11:52 AM, Dan Asimov <dasimov@earthlink.net> wrote:
PUZZLE: Find the n for which the invertible elements of Z/nZ are all square roots of unity.
The factors of 24 (such a cool number!). The factor 1 works because 0=1 in the trivial ring. -- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com