Abstract
We study the circulant complex Hadamard matrices of order n whose entries are lth roots of unity. For n=l prime we prove that the only such matrix, up to equivalence, is the Fourier matrix, while for n=p+q,l=pq with p,q distinct primes there is no such matrix. We then provide a list of equivalence classes of such matrices, for small values of n,l.
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