On 9/16/25, celebrate a date of mathematical beauty

Pythagorean Triple Square Day, as one man affectionately calls 9/16/25, is a day like no other this century.

On 9/16/25, celebrate a date of mathematical beauty
The date 9/16/25 represents a Pythagorean triple — that is, 3<sup>2</sup> +4<sup>2</sup> = 5<sup>2</sup>.

Pythagorean Triple Square Day, as one man affectionately calls 9/16/25, is a day like no other this century.

(Image credit: marekuliasz/iStockphoto)

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