Hi Dennis!
> Does anyone know of a quick math method that would get this combination?
> Right now I'm thinking I'll have to check each bit individually.
Well, the quickest solution is (as always ;-)) - a table.
Imagine a master 256 byte table with the numbers from 0-255.
These are all possible entries.
Now *just* remove all invalid entries. Regarding your current problem,
I assume the resulting table would be significantly smaller than 128, since both
10XXXX
01XXXX
alone already reduce half of the allowed numbers, right?
Well, in the end you'd generate a random number between 0 and #_of_results_table_entries-1
And read that indexed value from the results table.
Greetings,
Manuel
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