How about: 11, 13, 17, 19 .... etc
Prime numbers greater than 10 will only end in 1, 3, 7 or 9.
There are 21 two-digit prime numbers.
There are 5 of them.
2, 3, 5, and 7 are prime numbers for one digit numbers. 1 is NOT a prime number.
There are 17 such numbers.
Ten.
There are 21 two-digit prime numbers.
Prime numbers greater than 10 will only end in 1, 3, 7 or 9.
There are 5 of them.
2, 3, 5, and 7 are prime numbers for one digit numbers. 1 is NOT a prime number.
There are 17 such numbers.
2, 3, 5, and 7 are the only one-digit prime numbers.
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
17, 37, 47, 67, 97
997 is the largest 3-digit prime number.
there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100
73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.