Source: wikibot/singly-and-doubly-even
= Singly and doubly even
{wiki=Singly_and_doubly_even}
"Singly even" and "doubly even" typically refer to types of numbers in the context of mathematics, particularly in discussing properties of integers or sets of integers. 1. **Singly Even Numbers**: A number is termed "singly even" if it is divisible by 2 but not by 4. In other words, singly even numbers can be expressed in the form \\(4k + 2\\), where \\(k\\) is an integer.