As others have pointed out there is no math/magic formula, however there are different ways or perspectives of looking at the numbers that might give way to what we might think is workable solution. For example... Look at the Pick 3 Sums chart under the Resources tab here at Lottery Post you will notice that sums 12-15 have more numbers in each grouping than any of the other sums in the chart. Sums are each of the pick 3 digits added together. If you go thru the history of your pick 3 lottery writing down all the sums or just use a spreadsheet you would notice sums 12-15 probably show up with a certain regularity, but why?. Sums 12-15 have 15 numbers in each group. Because each number group has more numbers in it it is more likely that one of those numbers will hit. You can see one of those numbers are going to hit, but you don't know which one or when. If you were to count how many times sums 12-15 came out in the last 6 months or a year you might notice one of those sums came out more often than others. Lets say you bet .50 on each of the 15 numbers. That would cost you 7.50 to play for a 40.00 dollar win. Lets say the next game your numbers did not hit. Betting on those same numbers at .50 per number you would half to hit within 2 more plays at 7.50 per play as you would have invested 22.50 to win 40.00, most would say that's not worth while. But lets look again.. If none of your numbers hit after the first 7.50 play, you played the same numbers twice. Now you have bet 15.00 for an 80.00 dollar possible win, if one of your 15 numbers hit you win 40.00 x 2 at a total cost of 22.50. If none of those numbers hit, the next game you would play the same numbers 3 times, that's 7.50 x 3 which is 22.50 but don't forget to add in the 22.50 in losses we already have so far which bring the total cost of play to 45.00 for a possible 120.00 win. While we might think we can keep doing this until our chosen sum hits, you must keep in mind that the total cost of play cannot exceed 50% of what you would win. As your total cost of play reaches 50% of what you would win you would need to double your current bet to cover the total cost of play. If you were to to look at a sum skip and hit chart, you might notice that the sum number you chose might have skipped as many as 100 games at its highest skip in that sums skip history. If you work out that progressive bet idea for 100 games, the ammount of money spent for a 50% win could quickly become impractical. Think in terms of not just the money but how long it takes to fillout the play slips and how long it takes to print them at the lottery terminal. It could take hours to print 2000.00 dollars worth of .50 cent and 6.00 dollar combo tickets which may exceed the game cutoff time. I use this as an example, mabe not a very good one, but one where you see not only the possible up side where you may think its a workable solution, but the impracticality of it as well. Have a look around the forums, someone is always posting an idea. Maybe some of the discussions might spark ban idea with you that no one else has ever thought of.
Good Luck and have fun with it.