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Strong pseudoprimes to twelve prime bases
Let $\psi _m$ be the smallest strong pseudoprime to the first $m$ prime bases. This value is known for $1 \leq m \leq 11$. We extend this by finding $\psi _{12}$ and $\psi _{13}$. We also present an algorithm to find all integers $n\le B$ that are strong pseudoprimes to …