This is my old math related stuff blog divisibility.wordpress.com. I will soon be moving my blog to a new service (tried wordpress and medium and decided they aren’t customizable enough, so will update here after a while with the new location).
I frequently update older posts (especially the ones containing math preprints) since I like to keep similar topics together in one post. Much of the work here is hashed into the bitcoin blockchain using code from here. This allows me to keep track of when I created things.