Work it out dumb455
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The digit prime number below 10 is 2.
A Russian doll prime number is a prime number such that successively removing the right-most digit leaves a prime number.For example, 373 is a prime.Remove the last digit: 37 is a prime.Remove the last digit: 3 is a prime.There aer 83 such numbers in base-10 and the largest of these is 73,939,133.
The largest ten digit number with no repeated digits is '9876543210'.
A single digit prime number
I think it is: 9999999998