If the reverse square root of the reverse of square of a number is the number itself then it is Adam Number.
For ex., 12 and 21
Take 12
square of 12 = 144
reverse of square of 12 = 441
square root of the reverse of square of 12 = 21
The reverse square root of the reverse of square of 12 = 12, then number itself.
Such number is called Adam Number.
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