The integer n is a number expressed as the sum of an even number of different positive integers less than or equal to 2000. 1+2+ · · · +2000
Find all of the following positive integers that cannot be the value of n.
1. **Understanding the problem**: We need to find all positive integers that cannot be expressed as the sum of an even number of different positive integers less than or equal to 2000.

2. **Sum of first \( n \) integers**: The sum of the first \( n \) positive integers is given by:
   \[
   S = \frac{n(n+1)}{2}
   \]
   For \( n = 2000 \), the sum is:
   \[
   S = \frac{2000 \times 2001}{2} = 2001000
   \]

3. **Range of possible sums**: We need to determine the range of possible sums for an even number of different positive integers. Let \( 2k \) be the number of integers. The smallest sum is:
   \[
   1 + 2 + \cdots + 2k = \frac{2k(2k+1)}{2} = k(2k+1)
   \]
   The largest sum is:
   \[
   2000 + 1999 + \cdots + (2001 - 2k) = k(4001 - 2k)
   \]

4. **Range verification**: We need to show that all integers from \( k(2k+1) \) to \( k(4001-2k) \) are possible values of \( n \) for \( k \) from 1 to 1000. 

5. **Inequality check**: To ensure that all integers in the range are possible, we need to verify:
   \[
   (k+1)(2(k+1)+1) \le k(4001-2k)
   \]
   Simplifying, we get:
   \[
   2k^2 + 5k + 3 \le -2k^2 + 4001k
   \]
   \[
   4k^2 + 3996k - 3 \ge 0
   \]
   This inequality holds for \( k \) from 1 to 998.

6. **Boundary values**: We need to check the boundary values:
   - For \( k = 1 \):
     \[
     1(2(1)+1) = 3
     \]
   - For \( k = 999 \):
     \[
     999(4001-2(999)) = 999 \times 2003 = 2000997
     \]

7. **Excluded values**: The values 1 and 2 cannot be expressed as the sum of an even number of different positive integers. Additionally, we need to check the values around the upper boundary:
   - For \( k = 1000 \):
     \[
     1000(4001-2(1000)) = 1000 \times 2001 = 2001000
     \]
     The values 200098 and 200099 are not possible because:
     \[
     999(4001-2(999)) < 200098 < 1000(2(1000)+1)
     \]

8. **Conclusion**: The only positive integers which cannot be values of \( n \) are:
   \[
   \boxed{1, 2, 200098, 200099}
   \]