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数論的関数
Wikipedia definition
1. Arithmetic functionIn number theory, an arithmetic (or arithmetical) function is a real or complex valued function ƒ(n) defined on the set of natural numbers that "expresses some arithmetical property of n. " An example of an arithmetic function is the non-principal character (mod 4) defined by     where is the Kronecker symbol. To emphasize that they are being thought of as functions rather than sequences, values of an arithmetic function are usually denoted by a(n) rather than an.
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