I wrote the code to check perfect number and semipefrect number in Ruby. Semiperfect number is also called pseudoperfect number.
Continue reading Perfect Number and Semi-Perfect Number (Ruby)Tag Archives: 整数論
(日本語) \( \varphi(n) = \sum_{d|n} \mu(d) \frac{n}{d} \)
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(日本語) 整数論的関数の反転公式 メビウスの反転公式
(日本語) 約数についてのオイラー関数の総和は元の数になる
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