ABSTRACT
Suppose that you are playing with sums of divisors of numbers (yes, mathematicians do things like this) and you discover the following two examples: 1 + 2 + 3 = 6 1 + 2 + 4 + 7 + 14 = 28. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781351664110/4301f83b-fe0a-48e2-b043-811a356783b4/content/eq1408.tif"/>
