Nah, it goes in an order. Base58check is used to convert byte arrays into the readable bitcoin addresses. So the the first address (5HpHagT65TZzG1PH3CSu63k8Dbpv

Nah, it goes in an order. Base58check is used to convert byte arrays into the readable bitcoin addresses. So the the first address (5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf) has a byte array, in hex, of: 0000000000000000000000000000000000000000000000000000000000000001 Some people used those early addresses on purpose. Maybe for testing or something or I guess maybe due to a bug or something.