That would be 29.
The number is 23.
31.
There are actually three valid answers: 17, 53, and 71 All are prime and all have digits adding to 8.
995
There are two numbers that satisfy the criteria. 38 and 83
what number is prime to 40 29 - it's a prime number (divisible only by 1 and itself) and if you sum the two digits 2 + 9 = 11
13
2014 ( The sum of the digits = 7, a prime number )
The number is 23.
It is: 59
'17' is a prime number. The sum of the digits is 1 + 7 = 8 > 7.
67
I think it will be 17. The sum of digits is 8, which is the cube of 2.
31.
11
83
12