Today I read about perfect numbers and some related concepts in an online textbook called Elementary Number Theory that is available from LibreTexts. It was good to have a refresher on some of the finer points.
I will not be studying or blogging Tuesday or Wednesday because I will be busy wrapping up my house sitting and traveling home. I will return either Thursday or Friday, depending on how long it takes me to get settled again.
ETA: I have decided to return Monday, as some new commitments came up after I made this post.