Re: [math-fun] credit card numbers

Yes, see this: http://en.wikipedia.org/wiki/Credit_card_numbers In particular, all numbers beginning with 4 are Visa. ________________________________ From: Tom Rokicki <rokicki@gmail.com> To: math-fun <math-fun@mailman.xmission.com> Sent: Wednesday, June 24, 2009 9:02:09 AM Subject: Re: [math-fun] credit card numbers I'm pretty sure (based on cards issued to me) that the first few digits identify the bank, and for at least one bank, the last digits are issued predominantly sequentially.