Re: [math-fun] Prime question

On Tue, 25 Feb 2003, David Wilson wrote:

Let p be a good prime if it has only one digit or else a single digit can be deleted leaving a prime. Should we expect there to be a largest good prime?

My guess is no. I chose 10 random 200 digit primes and found that 5 of them were good primes. I did it again and found that out of 10 all 10 were good! This was done using Maple's probabilistic primality test "isprime". Actually in each case I first selected a ramdom 200 digit positive integer and then used the next 10 primes in a row to test for goodness. --Edwin