Its a prime number less then 19 sum of the digits is greater the 7?
Ummm... If I am correctly interpreting the question to be asking for a prime number less than 19, whose digits added together are greater than 7, then the answer is 17. There really aren't many options here (1, 2, 3, 5, 7, 11, 13, 17), only three of which even have multiple digits (11, 13, 17). So... 17<19, and 1+7 = 8, 8>7. qed?
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