University of Texas
Inside Mathematics: Houses in a Row [Pdf]
This task challenges a student to use knowledge of geometric and numerical patterns to identify and continue a pattern.
TED Talks
Ted: Ted Ed: Can You Find the Next Number in This Sequence?
1, 11, 21, 1211, 111221. Can you figure out what comes next in the number sequence? Alex Gendler reveals the answer and explains how beyond just being a neat puzzle, this type of sequence has practical applications as well.