# Talk:Upside-down numbers

Latest comment: 9 months ago by Petelomax in topic What does find mean?

## What does find mean?

What does find mean? The nth upside down number can be found formulaically so calculating the fifty millionth is no harder than the five millionth.--Nigel Galloway (talk) 14:25, 14 February 2023 (UTC)

find:, verb:, detect, discover, locate, observe If you are further confused maybe this will help. "The nth upside down number can be found formulaically so calculating the fifty millionth is no harder than the five millionth." Cool. Should be no problem then. đ --Thundergnat (talk) 15:49, 14 February 2023 (UTC)
Like Nigel Galloway said, it is easy to calculate the n.th number.
Just calculate the upper half in base 9, and add afterwards 1 to each digit
```digits deltaCount           number
1         1                   5
2         1                  19
3         9                 159
4         9                1199
5        81               11599
6        81              111999
7       729             1115999
8       729            11119999
9      6561           111159999
10      6561          1111199999
11     59049         11111599999
12     59049        111111999999
13    531441       1111115999999
14    531441      11111119999999
15   4782969     111111159999999
see numbers a plenty
15  10761679     999999951111111```

Horst (talk) 17:20, 14 February 2023 (UTC)

Tee hee, the (one-followed-by-one-hundred-zeroes)'th in 0s --Petelomax (talk) 16:05, 18 February 2023 (UTC)