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Because they're in multiples of three - a quick way to tell if a number is a multiple of three is to add up the digits and see if the digits add up to a multiple of three e.g 576, 5+7+6=18, 1+8=9, 9 is a multiple of three
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What 2-digit prime number has a sum of 10 when you add up its digits?
Two-digit prime numbers whose digits add up to 10 are:193773
What is the prime number that its digits adds up to 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.
What is a odd prime number which digits add up to 8 and is less than twenty but has 2 digits?
17
You are a prime number you have two digits The sum of your digits are 17 what number are you?
The only two digit numbers whose digits add up to 17 are 89 and 98. Since 98 is an even number, 89 is prime.
What is a two digit prime number whose digits add up to 5?
it is 23 because 2+3 = 5
What is the next year in which all its digits add up to a prime number?
2014 ( The sum of the digits = 7, a prime number )
What 2-digit prime number has a sum of 10 when you add up its digits?
Two-digit prime numbers whose digits add up to 10 are:193773
What is the prime number that its digits adds up to 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.
Is 111111 a prime number?
No. It is divisible by 3, as you will see if you add up the digits.
What is a number that has one prime number in it the digits add up to 19 it is a palindrome and the composite digits each have 4 factors?
838
What is a odd prime number which digits add up to 8 and is less than twenty but has 2 digits?
17
You are a prime number you have two digits The sum of your digits are 17 what number are you?
The only two digit numbers whose digits add up to 17 are 89 and 98. Since 98 is an even number, 89 is prime.
What is a two digit prime number whose digits add up to 13?
67
What is a two digit prime number whose digits add up to five?
23 or 41
How do you determine if 1041 is a prime number?
Since its digits add up to a multiple of three, it's divisible by three. That means it's not prime.
What is a two digit prime number whose digits add up to 5?
it is 23 because 2+3 = 5
What are the prime numbers that's digits add up to 13?
67
