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On binary cyclotomic polynomials. (English) Zbl 1368.11104

Summary: We study the number of nonzero coefficients of cyclotomic polynomials \(\Phi_m\), where \(m\) is the product of two distinct primes.

MSC:

11N13 Primes in congruence classes
11L20 Sums over primes
11C08 Polynomials in number theory
11N36 Applications of sieve methods
11L07 Estimates on exponential sums
11N05 Distribution of primes
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