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例子
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数组的左上角:
2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26
3, 9, 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75
5, 25, 35, 55, 65, 85, 95, 115, 125, 145, 155, 175, 185
7, 49, 77, 91, 119, 133, 161, 203, 217, 259, 287, 301, 329
11、121、143、187、209、253、319、341、407、451、473、517、583
13, 169, 221, 247, 299, 377, 403, 481, 533, 559, 611, 689, 767
17, 289, 323, 391, 493, 527, 629, 697, 731, 799, 901, 1003, 1037
19, 361, 437, 551, 589, 703, 779, 817, 893, 1007, 1121, 1159, 1273
23, 529, 667, 713, 851, 943, 989, 1081, 1219, 1357, 1403, 1541, 1633
29, 841, 899, 1073, 1189, 1247, 1363, 1537, 1711, 1769, 1943, 2059, 2117
...
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