Iteration

  • Loopy
    problem

    Loopy

    Age
    14 to 16
    Challenge level
    1 out of 3

    Investigate sequences given by $a_n = \frac{1+a_{n-1}}{a_{n-2}}$ for different choices of the first two terms. Make a conjecture about the behaviour of these sequences. Can you prove your conjecture?

  • Peaches in General
    problem

    Peaches in General

    Age
    14 to 16
    Challenge level
    2 out of 3

    It's like 'Peaches Today, Peaches Tomorrow' but interestingly generalized.

  • Triangle Incircle Iteration
    problem

    Triangle Incircle Iteration

    Age
    14 to 16
    Challenge level
    3 out of 3

    Keep constructing triangles in the incircle of the previous triangle. What happens?

  • Dalmatians
    problem

    Dalmatians

    Age
    14 to 18
    Challenge level
    1 out of 3

    Investigate the sequences obtained by starting with any positive 2 digit number (10a+b) and repeatedly using the rule 10a+b maps to 10b-a to get the next number in the sequence.

  • Difference Dynamics
    problem

    Difference Dynamics

    Age
    14 to 18
    Challenge level
    1 out of 3

    Take three whole numbers. The differences between them give you three new numbers. Find the differences between the new numbers and keep repeating this. What happens?

  • Archimedes Numerical Roots
    problem

    Archimedes Numerical Roots

    Age
    16 to 18
    Challenge level
    1 out of 3

    How did Archimedes calculate the lengths of the sides of the polygons which needed him to be able to calculate square roots?

  • A Very Shiny Nose?
    problem

    A Very Shiny Nose?

    Age
    16 to 18
    Challenge level
    2 out of 3

    This problem explores the biology behind Rudolph's glowing red nose, and introduces the real life phenomena of bacterial quorum sensing.

  • V-P Cycles
    problem

    V-P Cycles

    Age
    16 to 18
    Challenge level
    3 out of 3

    Form a sequence of vectors by multiplying each vector (using vector products) by a constant vector to get the next one in the seuence(like a GP). What happens?

  • Ford Circles
    problem

    Ford Circles

    Age
    16 to 18
    Challenge level
    3 out of 3

    Can you find the link between these beautiful circle patterns and Farey Sequences?