Hi all

I know that this is really way out of my league, I would love for
someone to come up with some code to check if a number is valid using
the check digit method I will paste below. (a 7 digit number which
really should be a 6 digit number with the 7th being the check digit)

I can just about work it out using a spreadsheet with loads of formulas
dotted about but would have a clue how to code something to check a
number according to this method.

Hope someone can help

Regards

Duncan

(see below for method)

The check digit is at the end of the number (7 digit number).

The check digit is calculated from the base number as follows: (base
number is first 6 digits)

Multiply digit 1 of the base number by 13,
digit 2 by 11,
digit 3 by 7,
digit 4 by 5,
digit 5 by 3,
digit 6 by 2

and add the results of these multiplications together

Divide the overall sum above by 11 and obtain the remainder.

Subtract the remainder from 11 to give the check digit.

If the check digit value is 11, change it to 0.
If the check digit value is 10, add 1 to the base number and repeat the
process.

Suffix the check digit to the base number to give the registration
number.

Note that with this in place, there will obviously be a 1 in 10 chance
of entering a 'valid' number which won't necessarily be correct.