1. Find all prime numbers that are 4 less than a perfect square.

( Mathematics Manual for 8th Grade, Dana Radu and Eugen Radu, Teora Publishing )
Subject 1.

| Solution Details | Associated Scoring |
| :---: | :---: |
| ![](https://cdn.mathpix.com/cropped/2024_06_07_8e6486d0593620c7c3edg-2.jpg?height=56&width=1567&top_left_y=984&top_left_x=197) | 2p |
| ![](https://cdn.mathpix.com/cropped/2024_06_07_8e6486d0593620c7c3edg-2.jpg?height=56&width=1567&top_left_y=1034&top_left_x=197) | $2 \mathrm{p}$ |
| - $\quad \mathrm{p}$ being a prime number $=>\mathrm{k}-2=1$ and k+2=p................................................................................. | $2 \mathrm{p}$ |
| ![](https://cdn.mathpix.com/cropped/2024_06_07_8e6486d0593620c7c3edg-2.jpg?height=56&width=1567&top_left_y=1134&top_left_x=197) | $1 \mathrm{p}$ |