## What is an Adam Number?

A number is called an **Adam number,** if the square of a number and the square of its reverse are reverse to each other.

Let us understand it through an example.

## Example of Adam Number

Let us take a number (N) = 13

The reverse of N = 31

Now, square of N i.e. (13)² = 169

Square of the reverse of the number N i.e. (31)² = 961

We observe that the square of 13 and the square of its reverse i.e. 31 are reverse of each other too. Hence 13 is an Adam Number. Infact, 31 is also an Adam number.

### Adam Numbers upto 1000

Adam numbers upto 1000 are:

0, 1, 2, 3, 11, 12, 13, 21, 22, 31, 101, 102, 103, 111, 112 , 113, 121, 122, 201, 202, 211, 212, 221, 301, 311.

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