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There is only one integer between these two numbers which contains both the digits 7 & 4.It is 347.
24 is the smallest example, 86 is the highest (unless both digits may be the same when you could have 22 & 88)
73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.
64.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
64