Talk:Upside-down numbers

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. 👍 --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, 5,000,000,000,000,000th in 0s Ack: I didn't quite spot you'd beaten me to it. --Petelomax (talk) 16:05, 18 February 2023 (UTC)