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Find the greatest prime divisor of the value of the arithmetic series
1 + 2 + 3 + \dots + 200

 Jun 19, 2024
 #1
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1 + 2 + 3 + ....+ 200  =  [ 1 + 200] * 100 = 

 

20100 =

 

201 * 100  =

 

67 * 3 * 5^2 * 2^2 

 

 

 

67 is the greatest prime divisor

 

cool cool cool

 Jun 19, 2024

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