Talk:Carmichael number

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 Definition:  A composite number c such that ac−1 ≡ 1 (mod c) for all a that are coprime with c. [d] [e]
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Carmichael numbers / Euler pseudoprimes

I'm not sure why it's asserted that every CN is an Euler pseudoprime. 2821 is a counterexample base 2, since 2^2821 == 1520 mod 2821, but 2821=7.13.31, lambda(2821) = lcm{6,12.30} = 60 and 60 | 2820. Richard Pinch 19:01, 22 October 2008 (UTC)

2821 is to many Bases eulerpseudoprime. It is eulerpseudoprime to the Bases: 3, 4, 9, 10, 12, 16, 17, 22, 23, 25, 27, 29, 30, ...
So 2821 is a Carmichael number, and it is an euler pseudoprime too. Not to every base, but to many bases. --Karsten Meyer 23:50, 8 November 2008 (UTC)
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