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Grade Vs Difficulty:
  EasyModerateChallengingPerplexing
1-2
3-4
5-6
7-8
9-10
11-12
13-14

This lesson explores cool patterns that arise when one considers the frequency sequence of a given sequence.

It is a sample from

James Tanton, Mathematical Outpourings: Newsletters and Musings from the
St. Mark’s Institute of Mathematics