SOLUTION: how many 2-digit prime numbers have 3 or 7 in the ones digit

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Question 390064: how many 2-digit prime numbers have 3 or 7 in the ones digit
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
13, 23, 43, 53, 73, 83

17, 37, 47, 67, 97 (you'll have to memorize a few primes to get these quickly)

Overall, 11 primes.