Is 11 a Crooked Number?

In mathematics, numbers are often classified according to their properties, such as odd or even, prime or composite, and so on. One of the lesser known categories is crooked numbers. These are numbers that, when written as a numeral, look slightly askew, such as 11. But is 11 really a crooked number? This article will explore the answer to this question and delve into the concept of crooked numbers.

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What are Crooked Numbers?

Crooked numbers, also known as skewed numbers, are numbers that appear to be off-center, slanted, or crooked when written as numerals. The most common example of a crooked number is 11. Other examples of crooked numbers include 101, 111, 121, and so on.

The Origins of the Term “Crooked Number”

The term “crooked number” is believed to have been coined by mathematician and philosopher Rene Descartes in the 17th century. Descartes used the term to describe numbers whose numerals were written in a slanted, or “crooked”, fashion.

Why are Numbers Written in a Crooked Manner?

The reason why some numbers are written in a crooked manner is due to the way numerals are constructed. When writing a numeral, the digits must be written in a straight line, but some numbers, like 11, require a slight bend in the line in order to fit all the digits.

How are Crooked Numbers Represented Mathematically?

Crooked numbers, like all numbers, can be represented in a variety of ways. The most common way to represent a crooked number is by using the base-10 system, which is the standard way of representing numbers in mathematics. In the base-10 system, a crooked number such as 11 is represented as 1011. Other representations of crooked numbers include binary (1011) and hexadecimal (B).

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Are All Crooked Numbers Prime Numbers?

No, not all crooked numbers are prime numbers. A prime number is a number that is divisible only by itself and 1. 11 is not a prime number since it can be divided by both 1 and 11. However, some crooked numbers, such as 101, are prime numbers.

Do Crooked Numbers Have Special Properties?

Yes, crooked numbers possess some unique properties that other numbers do not have. For example, all crooked numbers are divisible by 11. Additionally, all crooked numbers are odd, meaning they cannot be divided by 2.

What is the Relationship Between Crooked Numbers and Other Number Patterns?

Crooked numbers are related to other number patterns, such as palindromes and triangular numbers. Palindromes are numbers that are the same when read forwards and backwards, such as 101 or 121. Triangular numbers are numbers that can be represented as the sum of consecutive integers, such as 1+2+3+4+5+6+7+8+9+10+11 = 66.

Are There Any Interesting Facts About Crooked Numbers?

Yes, there are some interesting facts about crooked numbers. For instance, when a number is multiplied by 11, the result is always a crooked number. Additionally, 11 is the only single-digit crooked number.

Are There any Famous Crooked Numbers?

Yes, there are some famous crooked numbers. The most famous crooked number is 11, which is often used in sports, such as football and baseball, to denote a player’s uniform number. Additionally, the famous number pi, which is represented as 3.14159, is a crooked number.


To conclude, 11 is indeed a crooked number. Crooked numbers possess some unique properties and are related to other number patterns, such as palindromes and triangular numbers. Additionally, the most famous crooked number is 11, which is often used in sports to denote a player’s uniform number.