| Giver | Post | Date |
| GinoRako | If x is the decimal 8.1d5, with d as an unknown digit, and x | 19-Sep-2022 |
| dineshril | If x is the decimal 8.1d5, with d as an unknown digit, and x | 25-Aug-2017 |
| 2345678 | If x is the decimal 8.1d5, with d as an unknown digit, and x | 07-Apr-2015 |
| Jatin15 | If x is the decimal 8.1d5, with d as an unknown digit, and x | 21-Oct-2014 |
| SaharKhan | If x is the decimal 8.1d5, with d as an unknown digit, and x | 19-Oct-2014 |
| sunita123 | If x is the decimal 8.1d5, with d as an unknown digit, and x | 19-Oct-2014 |