The rules for generating bank account numbers are very complex and vary depending on banks, account types and other factors. Different banks have different coding systems and rule logic, and there is no unified and fixed standard sample and explanation. Generally speaking, bank account numbers contain a wealth of information, such as bank identification codes used to distinguish between different banking institutions, as well as parts used to identify specific account types, branches, sequence numbers, etc. For example, for common domestic bank card numbers, the first few digits may be the bank identification code, the middle part will reflect the information of the issuing branch, and the last few digits may be the check digit and the sequence code. If you want to learn more about the account number generation rules of a particular bank, it is best to contact the corresponding bank directly for consultation, they can provide the most accurate and detailed instructions.