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Old 2020-11-13, 02:45   #6
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Mar 2008

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Originally Posted by Ethan (EO) View Post
Is anything known about more than one single digit removed? What's the largest set of digits base-10 such that there at least (choose your own bound here) primes containing none of those digits?
There is no proof, but you could most likely withdraw nine digits, -- all except "1".
There is likely an infinity of primes that are decimal repeated units.
{R _ p} = {{10^p-1} \over 9}
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