When plugging one of the original numbers into this online calculator ( ) it doesnt match up to the end result I get using this.This means the first position is considered odd or even based on the length of InVal.Ie, if you want to calculate the check value x of 123456, then you need to think of the number as 123456x where x is position 1.
Changing luhnCheckSumRes luhnCheckSum(InVal) to luhnCheckSumRes luhnCheckSum(InVal10) in Function luhnNext(InVal As String) seems to work. This way it doesnt matter if the length of InVal is even or odd. Taken to its logical conclusion, the world of computing is built on algorithms. You can take a problem that seems intractable or vague and mechanize it and it ends at some point. Keep an eye on your inboxwell be sending over your first message soon. Credit Cards News Advice Credit Smart How the Luhn formula validates credit card numbers Topics BACK Search stories by card type Business Low Interest and 0 Intro APR Balance Transfers Cash Back Rewards Travel Search stories by topic Select a category Account management Balance Transfers Breaking News Business Card Comparisons Cash Back Cashing In QA columns Credit Scores and Reports Credit Smart Debt Management Expert QA Fine Print Get to the Points Have Cards, Will Travel Innovations and Payment Systems Keeping Score Legal, Regulatory, and Privacy Issues Low Interest and 0 Intro APR Matt About Money Opening Credits Products Rate Report Reaping Your Rewards Research and Statistics Rewards Rewards Programs Shopping Small Business Credit Profiles Speaking of Credit Student credit cards and young credit The Credit Guy To Her Credit Travel Videos Wealth and Wants Your Business Credit Search popular CreditCards.com topics Cashing In QA columns Get to the Points Keeping Score Wealth and Wants Reaping Your Rewards Have Cards, Will Travel Research and Statistics Credit Scores and Reports Rewards Programs Small Business Credit Profiles Breaking News Card Comparisons Close Credit Smart Advertiser Disclosure How the Luhn formula validates credit card numbers SHARE: Tweet Share Share Reddit Email by Jay MacDonald June 4, 2010 Advertiser Disclosure Filed Under: Credit Smart Summary Think of it as your cards Da Vinci Code: A little known, low-tech mathematical sleight-of-hand is used to see whether numbers on credit and debit cards are real or fake The content on this page is accurate as of the posting date; however, some of our partner offers may have expired. ![]() Did you know your credit card has a Da Vinci Code Its true: Those seemingly random raised numerals on your card not only contain the account identifiers that banks and merchants need to transact business on your behalf, but a little-known credit card version of the Da Vinci Code that verifies its validity without the aid of computers. Its pretty cool that something that was developed pre-computer is still in use today. I think thats really important, says Derrick Niederman, a MIT-educated mathematician, New York Times crossword puzzle creator and author of many recreational mathematics books, including Number Freak. Luhn Algorithm Calculator Excel Code Is CrypticallyEven cooler, the code is cryptically hidden within the sequence of the card numbers themselves. Whats in your wallet, Dan Brown This low-tech mathematical sleight-of-hand, dubbed the Luhn formula after its inventor Hans Peter Luhn, played a tangential role in the development of the World Wide Web, search engines such as Google, text messaging and other high-tech wonders that make modern life a whirl. Perhaps equally important at happy hour, every credit, debit and ATM card on earth still contains this mind-blowing bar trick worthy of the Beer Pong Hall of Fame. ![]() Click the first button to enter the fake digits: Now, print out this Luhn formula PDF and test your own credit or debit card number. Cool, right Want to know how, and more importantly why, it works Prepare to become a Luhn-atic. Luhn Algorithm Calculator Excel Series Of RandomCheck number, please In the unlikely event that youve given any thought at all to your credit card number, you probably view it as merely a series of random numerals: 16 digits on Visa, MasterCard and Discover cards, 15 on American Express cards, and 14 on Diners ClubCarte Blanche cards. My colleague Jeremy Simon has explained the meanings of these card numbers in more detail. But there is absolutely nothing random about the final digit of your credit or debit card number. It has been appended as a check number or key to verify that the card is valid. Its this check number that gives the Luhn formula its Da Vinci Code allure. When a card number is generated using Luhns algorithm, various combinations of the digits on the card must ultimately add up to a number that is perfectly divisible by 10. For this reason, Luhns formula is also referred to as modulus 10 or mod 10 for short. Change any digit or transpose nearly any two digits and the Luhn check will catch it. Essential reads, delivered weekly Subscribe to get the weeks most important news in your inbox every week. Enter your email address Subscribe By providing my email address, I agree to CreditCards.coms Privacy Policy Your credit cards journey is officially underway. Taken to its logical conclusion, the world of computing is built on algorithms. You can take a problem that seems intractable or vague and mechanize it and it ends at some point.
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