are you sure?
It seems base58 would have a 1/58th chance for a '1'
There are no bitcoin addresses starting with "1Z...", "1Y..." The formula for probability is more complicated
No?
Address: 1ZXt58NWzZaGxmdcYBccLJL2WNQrTqhuR
Privkey: 5JCQvCDYtQ9fKkkngyAMsS2przu41Gv5KfC4F7zC4XYbikJyXQX
Address: 1YoF7HgrHKxrSH3TyawU9r61DkShpqKd6
Privkey: 5K8r11CxkJy3nJURHEUjpt1zRP8gChNparReacZKsLi2zpCbzoR
For a reference that hhanh00 is correct, see the footnote (marked with *), here[1]
[1]
https://en.bitcoin.it/w/images/en/9/9b/PubKeyToAddr.png