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what four digits do not appear in the first twenty square numbers?

 Oct 4, 2015

Best Answer 

 #3
avatar+130511 
+5

Maybe 242   ????  →  576

 

 

cool cool cool

 Oct 4, 2015
 #1
avatar+118723 
+10

what four digits do not appear in the first twenty square numbers?

 

1,4,9,16,25,36,49,64,81,100

121,144,169,196,225,256,289,324,361,400

 

There is the first 20 squared numbers

7 is the only digit not there.

 Oct 4, 2015
 #2
avatar+118723 
+5

Now the question becomes.

Does any squared number contain the digit 7 ?

If so what is the first squared number that contains the digit 7 ?

 Oct 4, 2015
 #3
avatar+130511 
+5
Best Answer

Maybe 242   ????  →  576

 

 

cool cool cool

CPhill Oct 4, 2015

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