Processing math: 100%
 
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avatar+937 

No calc please

 May 28, 2019
 #3
avatar+9488 
+3

The possible values of  n  are:

 

1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47

 

And the elements in the set are:

 

124,524,724,1124,1324,1724,1924,2324,2524,2924,3124,3524,3724,4124,4324,4724

 

So the sum of the elements in the set   =   38424   =   16

 May 30, 2019

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