Luhn algorithm: Difference between revisions

Revision as of 11:27, 31 August 2023

Revision as of 11:29, 31 August 2023

Line 31:

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! Multipliers

| 2

| 1

| 2

Line 41 ⟶ 40:

| 2

| 1

| 2

|-

!

Line 55:

|-

!

| 147

| style="background: #FFA;" | '''918'''

| 189

| style="background: #FFA;" | '''34'''

| 147

| style="background: #FFA;" | '''86'''

| 189

| style="background: #FFA;" | '''116'''

| 147

| style="background: #FFA;" | '''2'''

| 14

| style="background: #FFA;" | '''3'''

| 18

| style="background: #FFA;" | '''8'''

| 14

| style="background: #FFA;" | '''1'''

|-

! Sum digits

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|}

The sum of the resulting digits is 6667.

The check digit is equal to <math>10 - (6667\operatorname{mod} 10) = 43</math>.

This makes the full account number read 7992739871479927398713.

=== Example for validating check digit ===

# Drop the check digit (last digit) of the number to validate. (e.g. 7992739871479927398713 -> 7992739871)

# Calculate the check digit (see above)

# Compare your result with the original check digit. If both numbers match, the result is valid. (e.g.<math>(givenCheckDigit = calculatedCheckDigit) \Leftrightarrow (isValidCheckDigit)</math>).