| Num | Name | Problem | Status | Time |
| 21 | sinan | Of mathematicians and hats |  | 4 months ago |
| 22 | sinan | Best subarray | | 4 months ago |
| 23 | sinan | Best subarray |  | 4 months ago |
| 24 | sinan | Modular Golden Ratio | | 4 months ago |
| 25 | sinan | The Kimberling Conjecture | | 5 months ago |
| 26 | sinan | DNA Automaton | | 5 months ago |
| 27 | sinan | The large cattle | | 5 months ago |
| 28 | sinan | The large cattle | | 5 months ago |
| 29 | sinan | The large cattle | | 5 months ago |
| 30 | sinan | The large cattle | | 5 months ago |
| 31 | sinan | Prime Magic Squares | | 5 months ago |
| 32 | sinan | Exploring the Calkin-Wilf Tree | | 6 months ago |
| 33 | sinan | Fill the boxes | | 6 months ago |
| 34 | sinan | Fill the boxes | | 6 months ago |
| 35 | sinan | Fill the boxes | | 6 months ago |
| 36 | sinan | Fill the boxes | | 6 months ago |
| 37 | sinan | Fill the boxes | | 6 months ago |
| 38 | sinan | Fill the boxes | | 6 months ago |
| 39 | sinan | Fill the boxes | | 6 months ago |
| 40 | sinan | Generalized Continued Fractions | | 6 months ago |
