table of tables SQL syntax query

Does anybody have an idea on how to correctly formulate an SQL query to retrieve only records in testtable that have one value of y being 1 or 3 (ie returning Larry and Peter)?
Thanks
Barry

CREATE OR REPLACE TYPE testtype AS TABLE OF NUMBER(6); /
CREATE TABLE testtable (x VARCHAR2(20), y testtype) NESTED TABLE y STORE AS testtableoftables;
COMMIT;
INSERT INTO testtable (x,y) VALUES
('Peter',testtype(3,3,5,102.4,6,10));

INSERT INTO testtable (x,y) VALUES ('Thomas',testtype(75,20,50));
INSERT INTO testtable (x)   VALUES ('Mary');
INSERT INTO testtable (x,y) VALUES ('Larry',testtype(402,1,20));