4
実用的な数値を計算する
定義 正の整数nは、すべてのより小さい正の整数がの別個の約数の合計として表される場合に限り、実用的な数値(OEISシーケンスA005153)ですn。 たとえば18、実用的な数値です。除数は1、2、3、6、9、18であり、18より小さい他の正の整数は次のように形成できます。 4 = 1 + 3 5 = 2 + 3 7 = 1 + 6 8 = 2 + 6 10 = 1 + 9 11 = 2 + 9 12 = 3 + 9 = 1 + 2 + 9 = 1 + 2 + 3 …
18
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