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Pick two or fewer different digits from the set {1, 3, 6, 7} and arrange them to form a number. How many prime numbers can we create in this manner?

 Jul 12, 2020
 #1
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 3  7   13   31   17    71      37   73   67        See any more?

 Jul 12, 2020
 #2
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Add 61 to the list for a total of 10.

Guest Jul 12, 2020
 #3
avatar+28021 
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Yep....correct....missed that one ! cheeky   Thanx !

ElectricPavlov  Jul 12, 2020

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