select 'HELLO1', dbms_utility.get_hash_value('HELLO6',5,1232312) from dual;

http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_util.htm#i1003646

GET_HASH_VALUE Function

This function computes a hash value for the given string.

Syntax

DBMS_UTILITY.GET_HASH_VALUE (
   name      VARCHAR2, 
   base      NUMBER, 
   hash_size NUMBER)
  RETURN NUMBER;

Generate HASH Value for a string

Oracle

SQL