18
旋转对称数
给定一个整数,如果它是相同的上下颠倒(旋转180°),则输出真实值,否则输出虚假值。 0,1并且8具有旋转对称性。6成为9,反之亦然。 产生真实结果的数字序列:OEIS A000787 0, 1, 8, 11, 69, 88, 96, 101, 111, 181, 609, 619, 689, 808, 818, 888, 906, 916, 986, 1001, 1111, 1691, 1881, 1961, 6009, 6119, 6699, 6889, 6969, 8008, 8118, 8698, 8888, 8968, 9006, 9116, 9696, 9886, 9966, 10001, 10101, 10801, 11011, 11111, 11811, 16091, …
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