Edward F. Schaefer

activity

20152021

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math.NT2021

Using Fibonacci factors to create Fibonacci pseudoprimes

Junhyun Lim, Shaunak Mashalkar, Edward F. Schaefer

Carmichael showed for sufficiently large $L$ , that $F_{L}$ has at least one prime divisor that is $\pm 1 (mod L)$ . For a given $F_{L}$ , we will show that a product of distinct o…

math.NT2020

Elliptic curves with Galois-stable cyclic subgroups of order 4

Carl Pomerance, Edward F. Schaefer

Infinitely many elliptic curves over $Q$ have a Galois-stable cyclic subgroup of order 4. Such subgroups come in pairs, which intersect in their subgroups of order 2. Let $N_…