diff --git a/exercises/perfect-numbers/description.md b/exercises/perfect-numbers/description.md index 26214fb5c2..cb056d92af 100644 --- a/exercises/perfect-numbers/description.md +++ b/exercises/perfect-numbers/description.md @@ -1,11 +1,10 @@ # Description -Determine if a number is perfect, abundant, or deficient based on -Nicomachus' (60 - 120 CE) classification scheme for positive integers. +Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers. The Greek mathematician [Nicomachus][nicomachus] devised a classification scheme for positive integers, identifying each as belonging uniquely to the categories of **perfect**, **abundant**, or **deficient** based on their [aliquot sum][aliquot-sum]. The aliquot sum is defined as the sum of the factors of a number not including the number itself. -For example, the aliquot sum of 15 is (1 + 3 + 5) = 9 +For example, the aliquot sum of `15` is `1 + 3 + 5 = 9`. - **Perfect**: aliquot sum = number - 6 is a perfect number because (1 + 2 + 3) = 6