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Really loved treading this.

Thanks...but I screwed up my formulas, ha. It's not as good in actuality--the lowest probability is still too high. Even if you include d100, the lowest probability of success is still 0.26. So, hrm, back to the drawing board...there may be something here though, I'll keep playing with it and I'll let you know if I write anything up.

Hiya! I just picked this up as part of the "No ICE in CA" bundle. The idea of using primes as a specific result blew my mind. Anyway I put together a little table of the regular d4-d20s, their probabilities of a critical success (1), their probability of hitting a prime, and the sum of the two (I was thinking of it in terms of a prime being a success, and you can use larger dice for more difficult attempts).

I then appended the same 1 and prime probabilities for the weirdo DCC dice (d5-d30), for people who might want to use those. 

It's not the same as Dodeca, as it wouldn't be an oracle, but rather a resolution mechanic for a game with a GM, though now that I'm thinking about it, certainly a solo player could use it if they wanted to for resolutions of attempted actions. They could, for example, replace the percentiles in Mythic based on the odds determination, if a person prefers to use a bunch of different dice...

Anyway, here's the table. I may write this up as a one pager and post it on its own, I don't know.