This is my entry in #SoMEpi . The perfect numbers are some of the most famous in all of number theory. But since perfection is so hard to achieve, we're naturally drawn to the mathematical quest for perfection. That manifests itself in the form of many types of almost perfect numbers.
70 is weird: youtube.com/watch?v=jrhVJKSKNwk
0:00 Intro
2:04 Descartes
6:06 Quasi perfect
8:11 Almost perfect
9:44 Aliquot sequences
15:37 Multiply perfect
19:00 Hemi perfect
20:06 Relative abundance clubs
22:51 Near perfect
24:43 Unitary perfect
26:46 Sublime
28:55 Outro
#math #numbertheory #perfectnumber