[nomadking]

It would be easy to maintain a list on paper. There are only 2 draw a week when something changes. Keep a list of the draw number of when last drawn for each of the 49 numbers. If a number if drawn again, subtract the current draw number from the draw number on the list, add 1 and you have how many draws ago it was last drawn. You could even prepare a list each time doing the calculations in advance and just reading off this new list.