Product Code Generator

This project is extremely simple if you know what you are doing. I need a Product Code Generator that can be used to create product serial numbers. Product Codes have a prefix for example "ATHBLU04". The program will take input on screen for the prefix and generate a specified number of random suffixes to create the? unique serial number. For example: Input Prefix: ATHBLU04 Qty Required: 5 Output ATHBLU041763367 ATHBLU041763452 ATHBLU041763421 ATHBLU041763455 ATHBLU041763342 The suffix will include the final digit as a check digit based on a pre-specified formula to be supplied to the winning bidder. The output will be in a text box that can be copied and pasted into another application. I expect the final version to be a single PHP file that I can load onto my webserver. Duplicates will be screened and found in another system. No database is required as there is no need for storage. All source code is to be provided and will be owned by me. Fast turnaround is good. I want to award this project in 48 hours time and have the project complete within 48 to 72 hours thereafter. Thanks, Balraj