Repeatedly Appending Digits and Only Finding Composites

I have uploaded slides for my talk at next month's PANTS meeting. The title is "Repeatedly Appending Digits and Only Finding Composites". It is based on joint work with Witold Jarnicki, John Rickert, and Stan Wagon. You can find the paper at Stan's site.

Constructing Carmichael numbers through improved subset-product algorithms

A pre-print of "Constructing Carmichael numbers through improved subset-product algorithms" is now available at the math arXiv. The paper contains research Red Alford and I did. It also contains research by our co-authors, Steven Hayman and Andrew Shallue, who have some impressive constructions and interesting algorithms. I hope to modify the code they wrote to expand the computations of Carmichael numbers with exactly k factors, which was done on a computer that is now outdated.