在等差数列{a n}中，a 1＞0，3a 8=5a 13，则前n项的和S n中最大的是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13505' and id < 1096752 and id<>'1096752' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13505' and id > 1096752 and id<>'1096752' order by id asc limit 5