Find Carmichael number sage

for n in range(2,7000):
    if not is_prime(n):
        carmichael = True
        for a in range(1,n):
            if Mod(a,n)^n != Mod(a,n):
                carmichael = False
                break
        if carmichael:
            print n

Source: math.ucdavis.edu

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