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Sunday, 20 September 2015

A 13 step problem

When I go up my stairs in a hurry, I take some steps two-at-a-time. This morning, I climbed my thirteen steps in this pattern: 1, 2, 1, 2, 1, 1, 2, 1, 2. Yesterday the pattern was 1, 1, 1, 1, 1, 1, 2, 2, 1, 2. How many days do you think I can go before I have to repeat a pattern?

This is from the NRICH site.
and is referenced in this blog post from Math with bad Drawings.

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