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Four primes $a$, $b$, $c$ and $d$ form an increasing arithmetic sequence with $a > 5$ and common difference 6. What is the ones digit of $a$?

 Jan 17, 2015

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One possibility is that the four primes are 11, 17, 23, 29.......so, the "ones" digit of "a"  = 1

 

 

 Jan 17, 2015

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 #1
avatar+130536 
+5
Best Answer

One possibility is that the four primes are 11, 17, 23, 29.......so, the "ones" digit of "a"  = 1

 

 

CPhill Jan 17, 2015

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