WITH n AS (SELECT ROWNUM n FROM DUAL CONNECT BY ROWNUM<=9)
,t(lvl,path) AS (
SELECT 1,TO_CHAR(n) FROM n
UNION ALL
SELECT lvl+1,path||n
  FROM t,n
 WHERE INSTR(path,n)=0
       AND MOD(path||n,lvl+1)=0
)
SELECT path FROM t WHERE lvl=9;