| Giver | Post | Date |
| Rahul878 | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 27-Apr-2022 |
| Bunuel | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 06-Dec-2020 |
| abcd0087 | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 08-Oct-2016 |
| WilDThiNg | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 04-Oct-2016 |
| aimenabdullah | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 19-Sep-2016 |
| msrivas2 | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 24-May-2016 |
| pfunk001 | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 17-Nov-2015 |
| jreg | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 13-Aug-2015 |
| Rk91 | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 03-Aug-2015 |
| abhinavgaur | K = wxyz, where w, x, y, z are prime numbers. Not including 1 and K | 05-Jul-2015 |