2,3,5 and 7
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2,3,5 and 7
The prime number less than 10 that, when added to either 10 or 20, results in a prime number is 3. When you add 10 to 3, you get 13, which is a prime number. Similarly, when you add 20 to 3, you get 23, which is also a prime number.
The sum of all prime numbers less than ten is 17. Pick a number 18 or higher.
26
Prime numbers less than 10 are: 2 3 5 and 7