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Legacy Documentation
The Mathematical Explorer
TM
(2001)
This is documentation for an obsolete product.
Current products and services
IBM
IBM
is a check digit method. For the 13 digit number
, it defines the check digit to be
where
is the number of the digits
that are greater than 5.
See
The Mathematical Explorer
:
The IBM Scheme
.
See also:
AddCheckDigit
,
VerifyCheckDigit
.
Further Examples
where 
is the number of the digits 
that are greater than 5.