Ours go to 211: Euler pseudoprimes to 47 prime bases (from Carmichael numbers)

Alejandra Alcantarilla Sánchez, Jolijn Cottaar, Tanja Lange +1

In this paper we show that a certain subset of the Carmichael numbers contains good Euler pseudoprimes, composite numbers that for many bases survive the Solovay-Strassen primality…