一个数列{an}各项是1或3,首项为1,且在第k个1和第k+1个1之间有2k-1个3,数列的前n项和为Sn.1.试问第2004个1为该项的第几项2.求a20043.求S20044.是否存在正整数m,使得Sm=2004?存在,求出m
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![一个数列{an}各项是1或3,首项为1,且在第k个1和第k+1个1之间有2k-1个3,数列的前n项和为Sn.1.试问第2004个1为该项的第几项2.求a20043.求S20044.是否存在正整数m,使得Sm=2004?存在,求出m](/uploads/image/z/10322847-63-7.jpg?t=%E4%B8%80%E4%B8%AA%E6%95%B0%E5%88%97%7Ban%7D%E5%90%84%E9%A1%B9%E6%98%AF1%E6%88%963%2C%E9%A6%96%E9%A1%B9%E4%B8%BA1%2C%E4%B8%94%E5%9C%A8%E7%AC%ACk%E4%B8%AA1%E5%92%8C%E7%AC%ACk%EF%BC%8B1%E4%B8%AA1%E4%B9%8B%E9%97%B4%E6%9C%892k-1%E4%B8%AA3%2C%E6%95%B0%E5%88%97%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn.1.%E8%AF%95%E9%97%AE%E7%AC%AC2004%E4%B8%AA1%E4%B8%BA%E8%AF%A5%E9%A1%B9%E7%9A%84%E7%AC%AC%E5%87%A0%E9%A1%B92.%E6%B1%82a20043.%E6%B1%82S20044.%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E6%AD%A3%E6%95%B4%E6%95%B0m%2C%E4%BD%BF%E5%BE%97Sm%EF%BC%9D2004%3F%E5%AD%98%E5%9C%A8%2C%E6%B1%82%E5%87%BAm)
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