Otherwise know and as friendly numbers. See also nice video from Numberphile about 220 and 284 (the first set of amicable numbers): https://www.youtube.com/wat

Otherwise know and as friendly numbers. See also nice video from Numberphile about 220 and 284 (the first set of amicable numbers): https://www.youtube.com/watch?v=fUSZBVYZdKY https://www.youtube.com/watch?v=fUSZBVYZdKY