Definition:Carmichael Number/Also known as
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Carmichael Number: Also known as
A Carmichael number is also referred to as a pseudoprime (or Fermat liar), as it exhibits the same properties as a prime when Fermat's Little Theorem is applied.
Because this property holds for all $a$ coprime to $n$, it is also referred to as an absolute pseudoprime.
Sources
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- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $561$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $561$
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Carmichael number
- Weisstein, Eric W. "Carmichael Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CarmichaelNumber.html