Car michael number is a composite number n which satisfy following relation:
for all integers b which are coprime to n.
For example, the smallest Carmichael number is 561. It has prime factors 3, 11, and 17, thus it is a composite number (not prime and not 1). The relation is true for all integers b that are not divisible by 3, 11, or 17 (coprime to 561).
Build a function isCarmichael(x) that returns true if x is a Carmichael number and false otherwise.
Hint: Since can become a big number, using a modular exponentiation algorithm may help.
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Last Solution submitted on May 30, 2026

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Chris Cleveland David Hill Dyuman Joshi Christian Schröder

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