On amicable numbers
Euler describes the work that European mathematicians have done on amicable numbers and shows how to find pairs of amicable numbers. He gives the first 30 pairs of which some, but not all, were found with his method. (Based on Jordan Bell's translation abstract.)
Original Source Citation
Nova acta eruditorum, Volume 1747, pp. 267-269.
Opera Omnia Citation
Series 1, Volume 2, pp.59-61.