# Category:Square Numbers

This category contains results about Square Numbers.

Definitions specific to this category can be found in Definitions/Square Numbers.

**Square numbers** are those denumerating a collection of objects which can be arranged in the form of a square.

They can be denoted:

- $S_1, S_2, S_3, \ldots$

### Definition 1

An integer $n$ is classified as a **square number** if and only if:

- $\exists m \in \Z: n = m^2$

where $m^2$ denotes the integer square function.

#### Euclid's Definition

In the words of Euclid:

*A***square number**is equal multiplied by equal, or a number which is contained by two equal numbers.

(*The Elements*: Book $\text{VII}$: Definition $18$)

### Definition 2

- $S_n = \begin{cases} 0 & : n = 0 \\ S_{n-1} + 2 n - 1 & : n > 0 \end{cases}$

### Definition 3

- $\displaystyle S_n = \sum_{i \mathop = 1}^n \left({2 i - 1}\right) = 1 + 3 + 5 + \cdots + \left({2 n - 1}\right)$

### Definition 4

- $\forall n \in \N: S_n = P \left({4, n}\right) = \begin{cases} 0 & : n = 0 \\ P \left({4, n - 1}\right) + 2 \left({n - 1}\right) + 1 & : n > 0 \end{cases}$

where $P \left({k, n}\right)$ denotes the $k$-gonal numbers.

## Subcategories

This category has the following 22 subcategories, out of 22 total.

### 1

### D

### F

### I

### N

### O

### S

### T

## Pages in category "Square Numbers"

The following 113 pages are in this category, out of 113 total.

### 1

### I

### N

- Number divides Number iff Square divides Square
- Number does not divide Number iff Square does not divide Square
- Number whose Square and Cube use all Digits Once
- Number whose Square is in 2 Identical Halves
- Numbers not Sum of Square and Prime
- Numbers whose Cube equals Sum of Sequence of that many Squares
- Numbers whose Sigma is Square
- Numbers whose Square is Palindromic with Even Number of Digits
- Numbers whose Squares are Consecutive Odd or Even Integers Juxtaposed
- Numbers whose Squares have Digits which form Consecutive Decreasing Integers
- Numbers whose Squares have Digits which form Consecutive Increasing Integers
- Numbers whose Squares have Digits which form Consecutive Integers

### P

- Palindromic Squares with Even Number of Digits with Non-Palindromic Roots
- Palindromic Squares with Non-Palindromic Roots
- Pandigital Pairs whose Squares are Pandigital
- Pandigital Square Equation
- Parity of Integer equals Parity of its Square
- Parity of Integer equals Parity of its Square/Even
- Parity of Integer equals Parity of its Square/Odd
- Product of Two Triangular Numbers to make Square

### S

- Sequence of Square Centered Hexagonal Numbers
- Sequence of Square Lucky Numbers
- Sequence of Squares Beginning and Ending with n 4s
- Set of 7 Anagrams which are Square
- Sigma Function Odd iff Argument is Square or Twice Square
- Smallest Non-Palindromic Number with Palindromic Square
- Smallest Pandigital Square
- Smallest Pandigital Square with Zero
- Smallest Square which is Sum of 3 Fourth Powers
- Square and Tetrahedral Numbers
- Square Cullen Numbers
- Square Fibonacci Number
- Square Formed from Sum of 4 Consecutive Binomial Coefficients
- Square Modulo 3
- Square Modulo 4
- Square Modulo 5
- Square Modulo 5/Corollary
- Square Modulo 8
- Square Number ending in 9 Digits in Reverse Order
- Square Number which is Sum of Consecutive Powers
- Square Numbers which are Sigma values
- Square Numbers which are Sum of Sequence of Odd Cubes
- Square Numbers whose Sigma is Square
- Square of 1 Less than Number Base
- Square of Odd Number as Difference between Triangular Numbers
- Square of Repdigit Number consisting of Instances of 3
- Square of Repdigit Number consisting of Instances of 6
- Square of Repunit times Sum of Digits
- Square of Reversal of Small-Digit Number
- Square of Small-Digit Palindromic Number is Palindromic
- Square Pyramidal Number also Square
- Square which is 2 Less than Cube
- Square which is Difference between Square and Square of Reversal
- Square whose Sigma is Cubic
- Squares Ending in Repeated Digits
- Squares equal to Sum of 2 Cubes
- Squares of form 2 n^2 - 1
- Squares of Small-Digit Repunits are Palindromic
- Squares which are 4 Less than Cubes
- Squares which are Difference between Two Cubes
- Squares whose Digits can be Separated into 2 other Squares
- Squares whose Digits form Consecutive Decreasing Integers
- Squares whose Digits form Consecutive Increasing Integers
- Squares whose Digits form Consecutive Integers
- Squares with All Odd Digits
- Squares with No More than 2 Distinct Digits
- Sum of 2 Squares in 2 Distinct Ways
- Sum of 2 Squares in 3 Distinct Ways
- Sum of 4 Consecutive Binomial Coefficients forming Square
- Sum of Consecutive Triangular Numbers is Square
- Sum of Sequence of Even Squares
- Sum of Sequence of Odd Squares
- Sum of Sequence of Squares
- Sum of Sequence of Squares of Primes
- Sum of Squares of Divisors of 24 and 26 are Equal
- Sums of Consecutive Sequences of Squares that equal Squares
- Sums of Partial Sequences of Squares
- Sums of Sequences of Consecutive Squares which are Square