Two-digit prime numbers whose digits add up to 10 are:
19
37
73
It is: 11 because 1+1 = 2 which is the smallest prime number
The smallest prime number, of course, is 2. The smallest prime number whose digits add up to 2 is, of course, 2. The next-smallest is 11. It is left as an exercise for the reader to determine whether the other numbers whose digits add up to 2 (e.g. 101, 1001, 10001) are prime.
The only two digit numbers whose digits add up to 17 are 89 and 98. Since 98 is an even number, 89 is prime.
17
If you add the digits together, you get 12. Since 12 is divisible by 3, 327 is also divisible by 3.
2014 ( The sum of the digits = 7, a prime number )
It is: 11 because 1+1 = 2 which is the smallest prime number
17
The smallest prime number, of course, is 2. The smallest prime number whose digits add up to 2 is, of course, 2. The next-smallest is 11. It is left as an exercise for the reader to determine whether the other numbers whose digits add up to 2 (e.g. 101, 1001, 10001) are prime.
The only two digit numbers whose digits add up to 17 are 89 and 98. Since 98 is an even number, 89 is prime.
838
No. It is divisible by 3, as you will see if you add up the digits.
No. It is also divisible by 3, as you will see if you add the digits of the number together.
17
67
23 or 41
Since its digits add up to a multiple of three, it's divisible by three. That means it's not prime.