random number generation

I need a small program that will generate random numbers. Criteria is: use the numbers 1-5, must be 6 characters long, no less, no more, no identical values, and no more than two occurances in a row.
Examples are: 123451 and 123451 (identical values) is bad. 434345 is good, 124445 is bad (more than two occurances in a row).
This needs to be done in some type of common format such as Excel, or as a stand alone program. It is required to print the values only, (prefer multiple columns per sheet,) but also viewing the values is better.