dave on Nostr: 質數： 2, 3, 5, 7, 11, 13, 17, 19 單數： 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, ...質數：2, 3, 5, 7, 11, 13, 17, 19單數：1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20可見單數比較多。
