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Unit digit prime = 2,3,5,7
2,5 not possible so 3 , 7
X3 , X7
X3 = 13 , 23 , 43 , 53 , 73 , 83
X7 = 17 , 37 , 47 , 67 , 97

Total = 6 + 5 = 11

Unique (old) Number System
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How many double digit primes numbers are there whose unit digit is a prime number 🤔
Unit digit prime = 2,3,5,7
2,5 not possible so 3 , 7
X3 , X7
X3 = 13 , 23 , 43 , 53 , 73 , 83
X7 = 17 , 37 , 47 , 67 , 97

Total = 6 + 5 = 11


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Unique (old) Number System™




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