+0  
 
0
514
3
avatar

1+1-1=41

2+2-2=142

3+3-3=363

4+4-4=???

 Aug 31, 2016
 #1
avatar+9665 
0

604? :D

 Aug 31, 2016
 #2
avatar+9665 
0

Just a guess.

 Aug 31, 2016
 #3
avatar
0

604 not correct

 Aug 31, 2016

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