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 May 3, 2020
 #1
avatar+111396 
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Note SpongeBob that

 

floor  [ sqrt (1)] , floor [ sqrt (2)], floor [sqrt(3)]  all = 1

And

floor  [ sqrt (4)]  through floor  [sqrt (8)]  =  2

And

floor [sqrt (9)] through floor [ sqrt (15)]  = 3

And floor [ sqrt (16) )]  = 4

 

So.....the sum is

 

3(1)  + 5(2)  + 7(3)  + 4  =

 

3 + 10 + 21  + 4  =

 

38

 

cool cool cool

 May 3, 2020

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