... What is the simple formula if i was to adjust the number of sides on each dice?
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The probability is related to n where n is the number of faces assuming an unbiased n-faced die. For a fair game generally, the players should have the same type of die, that is, n should be the same for each.

So the question is: what game are you playing? If the game is odds or evens, the probabilities of 100- and 130-faced dice are exactly the same-50%. The odds are evenly balanced, because 100 and 130 are both even numbers, so there are an equal number of odd and even numbers for 100 and 130. It would not be a fair game if n was odd for one player and even for the other. So different n for each player limits the number of fair games you could have. 

If the game was to roll a number greater than 50, say, then the game is unfair. The game would also be unfair if the winner was the player to roll a prime number, because there would be a different number of prime numbers between 1 and 100, and 1 and 130. so the nature of the game matters.

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