when does an address shows on blockchain? I have a ledger wallet which generates several public keys/addresses. Without having used any of them, some of them are shown in blockchain.info whereas other produce an "Unrecognized search pattern" error. Why does that happen? All these addresses come from the same master key.
Are you sure that you are checking Bitcoin addresses with blockchain.info (a Bitcoin address from a Ledger Wallet starts with a "1")? 

If there has not been sent any bitcoins to an address, then blockchain.info will show it without any transactions and a balance of zero. It should never say "unrecognized search pattern".