Legendre's formula

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Science and technology

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What Wikipedia says

In mathematics, Legendre's formula gives an expression for the exponent of the largest power of a prime p that divides the factorial n!. It is named after Adrien-Marie Legendre. It is also sometimes known as de Polignac's formula, after Alphonse de Polignac.

Excerpt from the Wikipedia article “Legendre's formula”, under the CC BY-SA 4.0 license. Read the article on Wikipedia