There is an integer, which holds a very special property. If you subtract any number from that integer, the resultant is exactly divisible by the successor of that number.
Can you find out that integer?
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It cannot be 1 because 1-n will not be divisible by n+1, so it should be -1, so -1 - n, --- Take note of this example. Lets say n=3 , 1-3 is NOT divisible 4, BUT -1-3 is divisible by 4