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Carmichael numbers

A Carmichael number is a composite number that satisfies Fermat's congruence for every integer relatively prime to it.

The first few carmichael numbers are: 561, 1105, 1729, 2465, 2821, 6601, 8911, 10585, 15841, 29341, 41041, 46657, …

43 of the first one million positive integers are carmichael.

Learn more about carmichael numbers on wikipedia.

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