A new freelancer. But have good knowledge in Mathematics, Programming, Excel and Algorithm Design as I have done Bachelor of Engineering in Computer Science and Master of Technology in Geo-informatics and have developed many algorithms for my project works in Bachelors and Mater degree.
As far I have understood, you need a user interface to accept a number, a back end algorithm to generate the 3 digit number combinations and color coded combinations to be displayed.
Should we discuss further details for the project at the earliest provided you consider me to give an opportunity.