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Earn +20 ptsQ: A prime number whose digit sum is 7?
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What is a 2-digit number and a prime number and the sum of its digits is 13?
67
The sum of my ones and tens digit is 10. My tens digit is greater than my ones digit. i am a prime number what number am i?
16
What is the sum ratio of the number of one digit prime numbers and the number of one digit composite numbers?
There are four of each.
Two prime numbers between 100 and 199 such that the tens digit is a prime number and the tens and ones digit taken together are a 2 digit prime number find the sum of these two prime numbers?
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.
What twin prime number whose sum is 84?
61 and 23.
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