To test some credit card validations in AC, I tried to generate credit card numbers using aqua.random.nextCreditCardNumber(). But numbers generated turned out to be invalid. How I detect this is using apache's org.apache.commons.validator.CreditCardValidator api. Some numbers obviously doesnt look like credit card numbers. Here is a sample output.

credit card number:  6723864:982:1581, isValid: false
credit card number:  5:0242480397538:, isValid: false
credit card number:  3097154255458039, isValid: false
credit card number:  571739255:858401, isValid: false
credit card number:  54204076178:1258, isValid: false

1. the aquascript to generate the chart
2. screen shot of the issue