Binary or Hash search in plsql table

I have a plsql table ( table of number index by binary integer) which has some values ( ~ 100 ).
Now I need to search through this plsql table for all of 10,000 rows from a database table (selected in a cursor).
Right now there is a linear search in place and I am looking at making it faster.
Because I am operating on a long column from the database table (for comparison) I cannot use bulk/sql operations.

Can any of the experts out there suggest a better way than the linear search. Or any built in function in pl/sql which will make my lookup faster ?

I am running on Oracle 9i.

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Sunil.