Also known as phi function, Euler phi function, Euler totient function, totient function
function which gives the number of integers relatively prime to and not greater than its input
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The first thousand values of φ(n). The points on the top line represent φ(p) when p is a prime number, which is p − 1.
In number theory, Euler's totient function counts the positive integers up to a given integer
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).