Mathematics, 26.03.2020 19:06 kaikao17801
We stated that the number 561 is a Carmichael number, but we never checked that a561 ≡ a (mod 561) for every value of a. (a) The number 561 factors as 3 · 11 · 17. First use Fermat’s little theorem to prove that a561 ≡ a (mod 3), a561 ≡ a (mod 11), and a561 ≡ a (mod 17) for every value of a. Then explain why these three congruences imply that a561 ≡ a (mod 561) for every value of a. (b) Mimic the idea used in (a) to prove that each of the following numbers is a Carmichael number. (To assist you, we have factored each number into primes.) (i) 1729 = 7 · 13 · 19
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We stated that the number 561 is a Carmichael number, but we never checked that a561 ≡ a (mod 561) f...
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