邪惡數
在數論中,邪惡數(evil number)是一組非負的整數,其有著偶數個數字1於它的二進位表示法中。此名称显然是对英文“偶数”(even number)的戏仿。
前幾個邪惡數是:
- 0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 23, 24, 27, 29, 30, 33, 34, 36, 39 ...[1]
這些數字在圖厄-摩爾斯數列給出了零值的位置。
不邪惡的數字被稱為可惡數。
參考資料
- Sloane, N.J.A. (编). . The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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