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[Math Help] Need to find formula for dual unique number sets

Heya folks; I am a certified perl developer. I have recently came across a need to for some possibly complex math, and I have not quite been able to figure it out yet. Please help. Usually in the past if I needed to make decently non-guessable and unique accountId numbers, I would just take the last accountId and do +13, or +27, etc, etc. Well, now theres a new problem. I have two account types in different locations on the systems (they cant not check with each other if id's are already in use). So, I need 2 accountId generaton formula's that will _never_ come up with the same number within the first 100,000 id's generated. I tried doing some test scripts in perl to find them, by just adding, so far no luck, but still messing with the scripts also. If you can just provide the formula to apply to last accountId used to make the new one unique, would be great. If any of this is confusing or I am just totally off sync with the math world, please let me know. Thanks.

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## Platform

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