SELECT * FROM (SELECT fnr || i1 || i2 || i3 || c1 || c2 pnr, CASE WHEN MOD(i3, 2) = 1 THEN 'F' ELSE 'M'END gender FROM ( WITH fnr AS (
        SELECT '261081' fnr
        , LPAD(CASE
            WHEN SUBSTR('261081',5,6) >= 50
            THEN TO_NUMBER(ROUND(dbms_random.VALUE(1,499)))
            ELSE TO_NUMBER(ROUND(dbms_random.VALUE(500,999))) END, 2, '0') random_num
        FROM dual)
    SELECT  fnr, random_num,
        TO_NUMBER(SUBSTR(fnr,1,1)) d1
        , TO_NUMBER(SUBSTR(fnr,2,1)) d2
        , TO_NUMBER(SUBSTR(fnr,3,1)) m1
        ,  TO_NUMBER(SUBSTR(fnr,4,1)) m2
        , TO_NUMBER(SUBSTR(fnr,5,1)) y1
        , TO_NUMBER(SUBSTR(fnr,6,1)) y2
        , TO_NUMBER(SUBSTR(random_num,0,1)) i1
        , TO_NUMBER(SUBSTR(random_num,1,1)) i2
        , TO_NUMBER(SUBSTR(random_num,2,1)) i3
        , CASE WHEN MOD(((3*TO_NUMBER(SUBSTR(fnr,1,1))) + (7*TO_NUMBER(SUBSTR(fnr,2,1))) + (6*TO_NUMBER(SUBSTR(fnr,3,1))) + TO_NUMBER(SUBSTR(fnr,4,1)) + (8*TO_NUMBER(SUBSTR(fnr,5,1))) + (9*TO_NUMBER(SUBSTR(fnr,6,1))) + (4*TO_NUMBER(SUBSTR(random_num,0,1))) + (5*TO_NUMBER(SUBSTR(random_num,1,1))) + (2*TO_NUMBER(SUBSTR(random_num,2,1)))), 11) = 0 THEN 0
                ELSE 11-MOD(((3*TO_NUMBER(SUBSTR(fnr,1,1))) + (7*TO_NUMBER(SUBSTR(fnr,2,1))) + (6*TO_NUMBER(SUBSTR(fnr,3,1))) + TO_NUMBER(SUBSTR(fnr,4,1)) + (8*TO_NUMBER(SUBSTR(fnr,5,1))) + (9*TO_NUMBER(SUBSTR(fnr,6,1))) + (4*TO_NUMBER(SUBSTR(random_num,0,1))) + (5*TO_NUMBER(SUBSTR(random_num,1,1))) + (2*TO_NUMBER(SUBSTR(random_num,2,1)))), 11) END c1
        , CASE WHEN MOD(((5*TO_NUMBER(SUBSTR(fnr,1,1))) + (4*TO_NUMBER(SUBSTR(fnr,2,1))) + (3*TO_NUMBER(SUBSTR(fnr,3,1))) + (2*TO_NUMBER(SUBSTR(fnr,4,1))) + (7*TO_NUMBER(SUBSTR(fnr,5,1))) + (6*TO_NUMBER(SUBSTR(fnr,6,1))) + (5*TO_NUMBER(SUBSTR(random_num,0,1))) +(4*TO_NUMBER(SUBSTR(random_num,1,1))) + (3*TO_NUMBER(SUBSTR(random_num,2,1))) + (2*(CASE WHEN MOD(((3*TO_NUMBER(SUBSTR(fnr,1,1))) + (7*TO_NUMBER(SUBSTR(fnr,2,1))) + (6*TO_NUMBER(SUBSTR(fnr,3,1))) + TO_NUMBER(SUBSTR(fnr,4,1)) + (8*TO_NUMBER(SUBSTR(fnr,5,1))) + (9*TO_NUMBER(SUBSTR(fnr,6,1))) + (4*TO_NUMBER(SUBSTR(random_num,0,1))) + (5*TO_NUMBER(SUBSTR(random_num,1,1))) + (2*TO_NUMBER(SUBSTR(random_num,2,1)))), 11) = 0 THEN 0
                ELSE 11-MOD(((3*TO_NUMBER(SUBSTR(fnr,1,1))) + (7*TO_NUMBER(SUBSTR(fnr,2,1))) + (6*TO_NUMBER(SUBSTR(fnr,3,1))) + TO_NUMBER(SUBSTR(fnr,4,1)) + (8*TO_NUMBER(SUBSTR(fnr,5,1))) + (9*TO_NUMBER(SUBSTR(fnr,6,1))) + (4*TO_NUMBER(SUBSTR(random_num,0,1))) + (5*TO_NUMBER(SUBSTR(random_num,1,1))) + (2*TO_NUMBER(SUBSTR(random_num,2,1)))), 11) END))), 11) = 0 THEN 0
                ELSE 11-MOD(((5*TO_NUMBER(SUBSTR(fnr,1,1))) + (4*TO_NUMBER(SUBSTR(fnr,2,1))) + (3*TO_NUMBER(SUBSTR(fnr,3,1))) + (2*TO_NUMBER(SUBSTR(fnr,4,1))) + (7*TO_NUMBER(SUBSTR(fnr,5,1))) + (6*TO_NUMBER(SUBSTR(fnr,6,1))) + (5*TO_NUMBER(SUBSTR(random_num,0,1))) +(4*TO_NUMBER(SUBSTR(random_num,1,1))) + (3*TO_NUMBER(SUBSTR(random_num,2,1))) + (2*(CASE WHEN MOD(((3*TO_NUMBER(SUBSTR(fnr,1,1))) + (7*TO_NUMBER(SUBSTR(fnr,2,1))) + (6*TO_NUMBER(SUBSTR(fnr,3,1))) + TO_NUMBER(SUBSTR(fnr,4,1)) + (8*TO_NUMBER(SUBSTR(fnr,5,1))) + (9*TO_NUMBER(SUBSTR(fnr,6,1))) + (4*TO_NUMBER(SUBSTR(random_num,0,1))) + (5*TO_NUMBER(SUBSTR(random_num,1,1))) + (2*TO_NUMBER(SUBSTR(random_num,2,1)))), 11) = 0 THEN 0
                ELSE 11-MOD(((3*TO_NUMBER(SUBSTR(fnr,1,1))) + (7*TO_NUMBER(SUBSTR(fnr,2,1))) + (6*TO_NUMBER(SUBSTR(fnr,3,1))) + TO_NUMBER(SUBSTR(fnr,4,1)) + (8*TO_NUMBER(SUBSTR(fnr,5,1))) + (9*TO_NUMBER(SUBSTR(fnr,6,1))) + (4*TO_NUMBER(SUBSTR(random_num,0,1))) + (5*TO_NUMBER(SUBSTR(random_num,1,1))) + (2*TO_NUMBER(SUBSTR(random_num,2,1)))), 11) END))), 11) END c2
    FROM fnr)  WHERE c1 <10 AND c2<10);