The following are examples of bank account number generation in different countries/regions (all are virtual test data and cannot be used in practice)： --- ###1. China Unionpay card number (19 digits, in line with Luhn algorithm) **example**：`6225 8801 3456 7890 123` **Generate logic**： 1. The first 18 digits are randomly generated (622588 starts with the virtual prefix of China Merchants Bank) 2. The last one is verified by the Luhn algorithm： -Starting from the penultimate place, the even digits are multiplied by 2 and then split into single digits to add -The sum of all numbers must be a multiple of 10 -In this example, the check digit `3` ensures that it is verified by Luhn --- ### 2. U.S. bank account (ABA routing number + account number) **example**： -**Route number**: `123456780` (fictitious) -**Account number**:`123456789012` **Verification rules**： -The 9th digit of the routing number is the check code, and the first 8 digits are calculated by the weight `3,7,1,3,7,1,3,7`, modulo 10 is equal to the check digit -In this example, `12345678' is calculated as the check digit `0`, which conforms to the rules --- ###3. IBAN International bank account number (German example) **Example**: `DE89 3704 0044 0532 0130 00` **Generate logic**： 1. Country code'DE` + verification code `89' + BBAN `370400440532013000` 2. Check code verification： - Convert to number `131400370400440532013000` -The calculation modulo is more than 97 1, this example has passed the verification --- ###4. UK bank account number (sort code + account number) **example**： -**Sort code**:`60-24-24` -**Account number**: `12345678` **Description**: UK account numbers are usually composed of a 6-digit sort code and an 8-digit account number. Some banks may add a verification code. --- ###5. Virtual credit card (16 digits, in line with Luhn) **Example**: `4222 1234 5678 9016` **Verification**: The last '6` ensures that it passes the Luhn verification --- **Precautions**： -The above examples are fictitious and cannot be used for real transactions. - Real accounts need to be generated by the banking system and strictly verified. -The Luhn algorithm prevents input errors, but cannot guarantee the authenticity of the account. For country-specific rules, please explain further!