Monthly Archives: November 2009

Who Am I?

Posted on November 29, 2009 by Brent

An excellent puzzle from JD2718: There are five true and five false statements about the secret number. Each pair of statements contains one true and one false statement. Find the trues, find the falses, and find the number. 1a. I … Continue reading →

Posted in challenges, logic, number theory, puzzles, teaching | Tagged , , | 13 Comments

m-bracelets code

Posted on November 27, 2009 by Brent

[15 January 2013: updated code to work with the latest versions of fgl and graphviz. Thanks to Conal Elliott for the updates!] By popular demand, here is the Haskell code I used to generate the images in my previous post. … Continue reading →

Posted in arithmetic, computation, links, pictures, programming | Tagged , , , , | 3 Comments

m-bracelets

Posted on November 22, 2009 by Brent

It is easy to generalize number bracelets to moduli other than 10—at each step, add the two previous numbers and take the remainder of the result when divided by m. Here are some pretty pictures I made of the resulting … Continue reading →

Posted in arithmetic, fibonacci, iteration, pattern, pictures, sequences | 6 Comments

One of these things is not like the others…

Posted on November 21, 2009 by Brent

Hat tip to Tanya Khovanova.

Posted in pattern | Tagged , | 9 Comments

Number bracelets

Posted on November 17, 2009 by Brent

Recently I’ve been volunteering with the middle school math club at Penn Alexander, a PreK-8 school in my neighborhood. Today we did (among other things) a fun activity I’d never seen before, called “number bracelets”. The students seemed to enjoy … Continue reading →

Posted in arithmetic, iteration, pattern, sequences, teaching | Tagged , , , | 12 Comments

minim

Posted on November 4, 2009 by Brent

A fun game I discovered recently, minim. In each level you start out with a network of numbered nodes, and the object is to successively combine the nodes according to certain mathematical rules in order to end up with only … Continue reading →

Posted in games, links | Tagged , | 1 Comment

Logicomix: An Epic Search for Truth

Posted on November 2, 2009 by Brent

I recently acquired a copy of Logicomix: An Epic Search for Truth, by Apostolos Doxiadis and Christos Papadimitriou, with art by Alecos Papadatos and Annie Di Donna. It defies categorization: is it a comic book? A biography? A book of … Continue reading →

Posted in books, logic, review | Tagged , , , , , , | 2 Comments