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Find the sum of the first seven prime numbers that have a units digit of 7.

 Apr 3, 2019
 #1
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7+17+37+47+57+67 +97 + 107=........

 Apr 3, 2019
edited by ElectricPavlov  Apr 4, 2019
 #2
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uhh 27 isn't prime

Guest Apr 3, 2019
 #5
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Hey...you're correct....neither is 57 !     cheeky

ElectricPavlov  Apr 4, 2019
 #3
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7 + 17 + 37 + 47 + 67 + 97 + 107 =379

EP: Are you getting too old? 27 and 57 are not prime numbers!.

 Apr 3, 2019
 #4
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Yep.....my birthday was a couple of days ago !   Haha !    Must have finally lost it .....cheeky

ElectricPavlov  Apr 4, 2019

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