Carmichael number
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Carmichael numbers
A Carmichael number is a composite numbers that satisfies Fermat's Little Theorem, 
or 
In this case, 
is the Carmichael number.
The first 
are:
\begin{align*} 561 = & 3 \cdot 11 \cdot 17 \\ 1105 = & 5 \cdot 13 \cdot 17 \\ 1729 = & 7 \cdot 13 \cdot 19 \\ 2465 = & 5 \cdot 17 \cdot 29 \\ 2821 = & 7 \cdot 13 \cdot 31 \\ 6601 = & 7 \cdot 23 \cdot 41 \\ 8991 = & 7 \cdot 19 \cdot 67 \end{align*}
See Also
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