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Von Mangoldt function
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, the von Mangoldt function is an <a href="/facts/Arithmetic_function/hULxwsgm">arithmetic function</a> named after <a href="/facts/Germany/paluuWBX">German</a> mathematician <a href="/facts/Hans_Carl_Friedrich_von_Mangoldt/FgCfoY4L">Hans von Mangoldt</a>. It is an example of an important arithmetic function that is neither <a href="/facts/Multiplicative_function/4kfolbBl">multiplicative</a> nor <a href="/facts/Additive_function/J5XLJSz4">additive</a>. </p>