Students who found that the PPSN check letter calculation assignments I set in JavaScript weren't challenging enough will be delighted to learn that the system is being extended. The number of people have have ever lived in Ireland would soon be greater than the 10 million possible under the current number scheme. So the letter after the check letter is going to be used from 2013. This will increase the maximum number 26 times. That should be plenty for the foreseeable future.
It does make the check letter calculation a bit more complicated than it was before. Interestingly ye old sexist W for Wife numbers will actually work fine alongside new W born after 2012 numbers, because by a huge coincidence W is the 23rd letter of the alphabet and so was taking up the zero slot anyway.
http://www.welfare.ie/en/Pages/Extension-of-the-Personal-Public-Service-Number-Range.aspx
So I must update my notes
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