Dobbiee
TF Premier
They can issue account numbers in series. My wife and 2 kids have only difference of last digit with a difference of +1. It was Pre-printed series of wealth account welcome kit in sequence.Yes your observation is right.
Banks don’t give account numbers or card numbers in a simple increasing order because it would make others too easy to guess. If someone knew one account number, they could figure out others, increasing the risk of fraud.
Not sure about cards. Havent tried asking for it.