I should also look for email domains as a strong indicator of affiliation.
Let EE be an elliptic curve defined over Q\mathbb{Q} and, for a prime pp of good reduction for EE let E~p\tilde{E}_p denote the reduction of EE modulo pp. Inspired by an elliptic curve analogue of Artin's primitive root conjecture posed by S. Lang and H. Trotter in 1977, J-P. Serre adapted methods of C. Hooley to prove a GRH-conditional asymptotic formula for the number of primes pxp \leq x for which the group E~p(Fp)\tilde{E}_p(\mathbb{F}_p) is cyclic. More recently, Akbal and Gülog˘\breve{\text{g}}lu considered the question of cyclicity of E~p(Fp)\tilde{E}_p(\mathbb{F}_p) under the additional restriction that pp lie in an arithmetic progression. In this note, we study the issue of which arithmetic progressions amodna \bmod n have the property that, for all but finitely many primes pamodnp \equiv a \bmod n, the group E~p(Fp)\tilde{E}_p(\mathbb{F}_p) is not cyclic, answering a question of Akbal and Gülog˘\breve{\text{g}}lu on this issue.
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