数字521代表什么意思

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select * from tbl_Articles WHERE ArticleID=110003 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=110003 LIMIT 0,1
select * from tbl_Articles_sphinx where id=110003 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1387415,1413307,1045655,1044382,1065221,1091703,1061534,1835687,1113584,1066118,983947,1088844,1089842,1059801,1045643,2134018,1073588,1067241,1078428,1916309,1475815,1364777,1043924,1488388,1092163,1778740,1412959,1042036,1075859,1081089) ORDER BY field (ArticleID,1387415,1413307,1045655,1044382,1065221,1091703,1061534,1835687,1113584,1066118,983947,1088844,1089842,1059801,1045643,2134018,1073588,1067241,1078428,1916309,1475815,1364777,1043924,1488388,1092163,1778740,1412959,1042036,1075859,1081089)