I believe the reason for this is that it's one of the simplest card numbers that passes the Luhn check: http://en.wikipedia.org/wiki/Luhn_algorithm http://en.w

I believe the reason for this is that it's one of the simplest card numbers that passes the Luhn check: http://en.wikipedia.org/wiki/Luhn_algorithm http://en.wikipedia.org/wiki/Luhn_algorithm