[1] Find all positive integers that cannot be written as the sum of 2 or more consecutive positive integers.

[2] Find all integers that cannot be written as the sum of 2 or more consecutive integers.

[3] Find all positive integers that can only be written as the sum of 2 or more consecutive positive integers in one way.

There are no integers that cannot be written as the sum of two or more consecutive integers.

If n is positive, it equals the sum of all the 2n integers

between -n+1 and n (inclusive)

If n is negative,

it equals the sum of all the -2n integers between n and -n-1 (inclusive)

if n is zero, it is the sum of -1, 0 and 1.

*Edited on ***April 14, 2011, 8:28 pm**

*Edited on ***April 14, 2011, 8:29 pm**