
Lite 
Add to a Square Number
Category:  Math 
Submitted By:  shenqiang 
Fun:  (1.82) 
Difficulty:  (2.85) 
A, B and C are positive integers such that 3^A+5^B+7^C is a square number.
What is the minimum value of this square number?
Answer:
3^3+5^1+7^2=81.
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