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For all positive integers n, the nth triangular number T_n is defined as T_n = 1 + 2 + ... + n . What is the greatest possible value of the greatest common divisor of 4T_n and n - 2?

 Dec 23, 2021
 #1
avatar+4 
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 Dec 23, 2021
 #2
avatar+505 
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Hint:

use the Euclidean algorithm to find \(\gcd(4\cdot\frac{n(n+1)}{2}, n-2)\)

 Dec 23, 2021

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