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Prime numbers, diophantine equations, diophantine approximations, analytic or algebraic number theory, arithmetic geometry, Galois theory, transcendental number theory, continued fractions

3 votes
1 answer
81 views

On composite divisors of certain terms in the extended Lucas sequences

One can easily show that if $p$ is a prime that does not divide $a$, then $a^{p(p-1)}\equiv 1 \pmod{p^2}$. However, my question is: If instead of $p$ being a prime, it were a pseudoprime to the base $ …
DDS's user avatar
  • 99
2 votes
1 answer
206 views

On pseudoprimes to the base $a$ (Fermat pseudoprimes)

In 1980, C. Pomerance, J. Selfridge, and S. S. Wagstaff defined a pseudoprime to the base a to be any composite odd $n$ such that $n \mid a^{n-1} - 1$. More recently, in 2013, S. S. Wagstaff referred …
DDS's user avatar
  • 99
2 votes
1 answer
218 views

On the computational complexity of Pepin's test

Let $F_{n} = 2^{2^{n}} + 1$, where $n > 0$. Pepin's Test asserts that $F_{n}$ is prime if and only if $F_{n} \mid 3^{\frac{F_{n} - 1}{2}} + 1$. QUESTION: What is the big-$\mathcal O$ complexity of thi …
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  • 99