Exercise on the development of interhemispheric connections of the brain.

Need to find all the number 1 to 90. It is recommended to repeat every week.
Share in comments a time, Skoko find all the numbers, we'll see who's the fastest))))
Exercise on the development of interhemispheric connections of the brain.

Need to find all the number 1 to 90. It is recommended to repeat every week.
Share in comments a time, Skoko find all the numbers, we'll see who's the fastest))))
| # | User | Rating |
|---|---|---|
| 1 | Benq | 3676 |
| 2 | jiangly | 3670 |
| 3 | Kevin114514 | 3657 |
| 4 | maroonrk | 3355 |
| 5 | Um_nik | 3353 |
| 6 | squareOf105 | 3346 |
| 7 | tourist | 3343 |
| 8 | strapple | 3324 |
| 9 | heuristica | 3322 |
| 10 | jiangbowen | 3291 |
| # | User | Contrib. |
|---|---|---|
| 1 | Qingyu | 158 |
| 2 | nik_exists | 150 |
| 2 | maspy | 150 |
| 4 | AmShZ | 143 |
| 5 | Um_nik | 141 |
| 6 | Errichto | 139 |
| 7 | adamant | 137 |
| 8 | BledDest | 133 |
| 8 | maroonrk | 133 |
| 10 | qwexd | 130 |
| Name |
|---|



Why are there 2 8's and no 81's?
Any assumptions?

I know 18 is upside-down 81, but it seems intentionally misleading. (also I cannot read Russian)
It seems that in circle should be 81, but 1 is erased.