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1,2,5;13,34,89;2336101597;41811094628657. 奇偶奇奇偶奇奇偶奇奇偶奇 從第一個數位開始,每三個一組,正好是“奇、偶、奇”的重複出現 2009/3=669.2 即第2009個數位,是第670組中的第二個,囙此為偶數
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