23
The number is 23.
sum
The 3 largest 2 digit prime numbers are 83, 89, and 97. The sum is 269
To write a Java program that prints the sum of the prime digits of a number, you can follow these steps: First, convert the number to a string to access each digit individually. Then, check if each digit (0-9) is prime (2, 3, 5, 7) and, if so, add it to a sum variable. Finally, print the sum. Here’s a simple code snippet: public class PrimeDigitSum { public static void main(String[] args) { int number = 123456789; // Example number int sum = 0; for (char digit : String.valueOf(number).toCharArray()) { int d = Character.getNumericValue(digit); if (d == 2 || d == 3 || d == 5 || d == 7) { sum += d; } } System.out.println("Sum of prime digits: " + sum); } }
995
There are four of each.
The number is 23.
sum
The 3 largest 2 digit prime numbers are 83, 89, and 97. The sum is 269
67
16
995
17, 53, 71
For the tens digit to be a prime number then it must equal 2, 3, 5 or 7. There are four 3-digit prime numbers that fit the above condition and also have the tens and units digits forming a 2-digit prime number. 131, 137, 173, 179. The person supplying the question may like to sum the various combinations.
31
No two digit prime number exists that is a multiple of 7. All two digit numbers that are multiples of 7 are compositenumbers.
They are: 89+97 = 186