| Giver | Post | Date |
| ajdelrosario | the sum s of the arithmetic sequence a, a+d, a+2d........+ a | 29-Sep-2024 |
| vt123 | the sum s of the arithmetic sequence a, a+d, a+2d........+ a | 21-Jul-2022 |
| Subham31 | the sum s of the arithmetic sequence a, a+d, a+2d........+ a | 17-May-2022 |
| Fade | the sum s of the arithmetic sequence a, a+d, a+2d........+ a | 25-Oct-2021 |
| Carcass | the sum s of the arithmetic sequence a, a+d, a+2d........+ a | 23-Feb-2018 |