Kredittkortkode May 19, 2019 21:00:52 GMT 1 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Koalani on May 19, 2019 21:00:52 GMT 1 A Secret Code in Credit Card Numbers25.8.2015There's a hidden mathematical pattern in your credit card (also works for debit cards or ATM cards). In this video I will teach you a mathematical magic trick based on the pattern.