11,21,27哪个是质数

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select * from tbl_Articles WHERE ArticleID=503309 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=503309 LIMIT 0,1
select * from tbl_Articles_sphinx where id=503309 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(371027,1479768,3410841,80015,1475042,1367396,520217,1366490,1018876,1066702,1157262,1468774,3380578,3201548,394540,371295,750092,989249,929848,1071135,745251,1498061,358723,395413,363069,1340901,393872,83215,394037,1367595) ORDER BY field (ArticleID,371027,1479768,3410841,80015,1475042,1367396,520217,1366490,1018876,1066702,1157262,1468774,3380578,3201548,394540,371295,750092,989249,929848,1071135,745251,1498061,358723,395413,363069,1340901,393872,83215,394037,1367595)