If the unlucky number is 13 and the lucky ones 7

Isnt it unusual that when you sum the digits of 13 ² (169) it makes 16, when you do that again it makes 7,

And so, when you do that for 7 ² (49) it makes 13.

If summed up digits of number makes 4 or 7, it does not alter nevertheless you change the number. (4 ² makes 16, 16 ² makes 256 etc.).

Pretty unusual, huh?

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