New to armory (a few questions)

[IgorTheArtist]

Hello,

I use Armory and am pretty new to bitcoin and related stuff. I generated a paper backup (pdf file) and have a lot of informations for each address. What is publicx, publicy, base58, hash160? The standard format for the private key is base58 right?

Another thing is I generated 40 addresses and they are shown in my wallet but the counter "used addresses" only shows "Addresses used: 39". Is it a bug due to the chain-count starts with a "0"?

Thanks