51为什么是合数

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select * from tbl_Articles WHERE ArticleID=3281510 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3281510 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3281510 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(782440,1144258,985071,520137,981236,80103,1214093,404711,1110238,89160,1435300,407078,1384669,853939,1181739,1757022,1412294,1180084,513233,733417,472300,932010,631939,810421,619833,1183015,947921,799700,1153693,2134843) ORDER BY field (ArticleID,782440,1144258,985071,520137,981236,80103,1214093,404711,1110238,89160,1435300,407078,1384669,853939,1181739,1757022,1412294,1180084,513233,733417,472300,932010,631939,810421,619833,1183015,947921,799700,1153693,2134843)