+0  
 
+1
28
1
avatar+31 

Some perfect squares (such as 100), have a digit sum (1+0+0=1) that is equal to the digit sum of their square root (1+0=1). Some other perfect squares (such as 121), have a digit sum (1+2+1=4) that is equal to the square of the digit sum of their square root ((1+1)2=4). What is the smallest perfect square greater than 100 that is in neither of these two categories?

 Jun 21, 2020
edited by OliverWood  Jun 21, 2020
 #1
avatar+31 
+1

the solution is

 

144 no

169 no 

196 yes

 Jun 21, 2020

11 Online Users