I think it is also sometimes a simple barrier to entry to weed out some candidates (think of it as a super simple fizzbuzz). I also see a lot of job postings a

I think it is also sometimes a simple barrier to entry to weed out some candidates (think of it as a super simple fizzbuzz). I also see a lot of job postings asking people to decode some string for bonus "points"... 90% of the time its just rot13.