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    SELECT LISTAGG(N,'&') WITHIN GROUP(ORDER BY N) PRIME_NO FROM( SELECT N FROM (SELECT LEVEL N FROM DUAL CONNECT BY LEVEL <=1000) WHERE N > 1 AND NOT EXISTS ( SELECT 1 FROM ( SELECT LEVEL D FROM DUAL CONNECT BY LEVEL <=1000 ) WHERE D >1 AND D < N AND MOD(N, D)=0 ) );