已知三角形三边长分别为3、15、X。若X 为正整数，则这样的三角形有多少？

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31553' and id < 2527829 and id<>'2527829' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31553' and id > 2527829 and id<>'2527829' order by id asc limit 5