2 votes Lehmer Factor Stencils: A paper factoring machine before computers Posted October 10, 2021 by river Tags: mathematics, technology, derrick lehmer, history, 1920s, quadratic residues, continued fractions, videos, proof of concept https://www.youtube.com/watch?v=QzohwKT6TNA Link information This data is scraped automatically and may be incorrect. Authors Proof of Concept Duration 26:06 Published Aug 21 2021