p1. Some natural numbers can be written as the sum of consecutive natural numbers. For example: $5 = 2 + 3$, $6 = 1 + 2 + 3$, $10 = 1 + 2 + 3 + 4$, $25 = 3 + 4 + 5 + 6 + 7$.  However, this is not possible with all natural numbers. Determine with what numbers it is not possible and prove such impossibility.


p2. Show that number $2^2+2^5+2^j$ is a perfect square only for the case $j = 6$.


p3. You have the numbers from $ 1$ to $100$ and each one of them is painted in one of the four colors red, blue, yellow or green. Show that there are two numbers of the same color, whose difference is also the same color.


p4.  $ABCD$ is a trapezoid, $ABIE$ is a parallelogram where $E$ is the midpoint of $AD$; $F$ is the midpoint of $BC$; the points $G$ and $H$ are the intersection of the segment $EI$ with the diagonals of the trapezoid. Show that if $AB/FI = 2001$, then $DC/GH = 1999$. 


p5. Determine all integer solutions of the equation $\frac{1}{x}+\frac{1}{y}=\frac{1}{2}$.


PS. Wording of P4 has been corrected thanks to vanstraelen.
1. **Define the Problem:**
   We need to determine which natural numbers cannot be written as the sum of consecutive natural numbers and prove such impossibility.

2. **Claim 1:**
   If \( n \) has an odd divisor \( k > 1 \), then \( n \) is a beautiful number (i.e., it can be written as the sum of consecutive natural numbers).

   **Proof:**
   - If \( n \) is an odd number, then we can write \( n = a + (a + 1) \) with \( a = \frac{n-1}{2} \).
   - If \( n \) is an even number, then write \( n = 2^s \cdot t \) with \( t > 1 \) being an odd number.
     - Let \( b = \frac{t-1}{2} \).
     - If \( 2^s \ge b \), then we can write \( n = i + (i+1) + \ldots + (i+t-1) = t(i+b) \) with \( i = 2^s - b \).
     - If \( b > 2^s \), then we can write \( n = [b - (2^s - 1)] + [b - (2^s - 2)] + \ldots + b + (b+1) + \ldots + (b + 2^s) \).

3. **Claim 2:**
   If \( n \) is a beautiful number, then there exists an odd natural number \( k > 1 \) such that \( k \mid n \).

   **Proof:**
   - Since \( n \) is a beautiful number, there exist \( i, h \in \mathbb{N}, h > 1 \) such that 
     \[
     n = i + (i+1) + (i+2) + \ldots + (i+h-1) = h \left( i + \frac{h-1}{2} \right)
     \]
   - If \( h \) is odd, then \( \frac{h-1}{2} \in \mathbb{N} \), so \( h \mid n \) and we are done.
   - If \( h \) is even, then 
     \[
     n = \frac{h}{2} (2i + h - 1)
     \]
     so \( 2i + h - 1 \) is odd and \( 2i + h - 1 \mid n \), we are done.

4. **Conclusion:**
   From Claims 1 and 2, we have shown that \( n \) is beautiful if and only if \( n \) has an odd divisor greater than 1. Therefore, the numbers that cannot be written as the sum of consecutive natural numbers are those that do not have any odd divisors greater than 1. These numbers are the powers of 2.

   Hence, the numbers that cannot be written as the sum of consecutive natural numbers are \( 2^s \) with \( s \in \mathbb{N} \), for example, \( 1, 2, 4, 8, \ldots \).

The final answer is \( \boxed{ 2^s } \) with \( s \in \mathbb{N} \).