Both the first three and the middle two have a pretty clear rhyme and reason to them which would likely make getting them right a not-so-difficult task after a

Both the first three and the middle two have a pretty clear rhyme and reason to them which would likely make getting them right a not-so-difficult task after a bit of homework. https://www.ssa.gov/history/ssn/geocard.html https://www.ssa.gov/history/ssn/geocard.html Anecdotally, while bored in math class we figured out that 10 or so of the guys in the class had one of two numbers for their first three.