👉 In mathematics, a phylomus is a non-terminating decimal expansion. It means that a number can be expressed as a sum of infinitely many terms each of which is either 1 or -1, and there are no other digits in the expansion. For example: - The number 3.765492... is a phylomus because it has 3 digits (0, 7, 6, 5) and 4 digits (1