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2020-11-13, 02:45   #6
Batalov

"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

22×2,333 Posts

Quote:
 Originally Posted by Ethan (EO) 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.
${R _ p} = {{10^p-1} \over 9}$