# Carol number

> English word · Noun

## Definitions
1. An integer of the form 4ⁿ-2ⁿ⁺¹-1.

## Etymology
First studied by Cletus Emmanuel, who named it after a friend, Carol G. Kirnon.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/carol-number