Carmichael's theorem states that if 
and 
are relatively prime so
that the greatest common divisor 
, then
 |
where 
is the Carmichael function.
Carmichael's Theorem
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Cite this as:
Weisstein, Eric W. "Carmichael's Theorem." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CarmichaelsTheorem.html