Mersenne Prime Origin Story
See Objectivity (293 videos and more to come) - https://www.youtube.com/c/objectivityvideos
Brady Haran is at the Royal Society looking at the book which resulted in the name "Mersenne Primes".
Mersenne Prime videos on Numberphile: https://www.youtube.com/playlist?list=PLt5AfwLFPxWKsTwVXpLscZdfiiqAkkGCA
The Royal Society library: https://royalsociety.org/about-us/what-we-do/collections/visitors/
Translation and explanation of the key section from Cogitata Physico-Mathematica - https://t5k.org/mersenne/LukeMirror/lit/lit_069s.htm
Great Internet Mersenne Prime Search - https://www.mersenne.org
