the next number is the average of these two
the next is the average of the last two
etc.
students can explore the limit - which is reached fairly quickly
the limit is a linear combination of the first two terms
this has been called 'Littov's chain' but someone (Raz Lamplugh) told me this was a made up name...
it generalises to e.g. choose any three numbers then repeatedly work out the average of the previous three numbers
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