Monthly Archives: October 2018

Post without words #23

Posted on October 29, 2018 by Brent
Posted in pattern, pictures, posts without words | Tagged , , , | 11 Comments

The wizard’s rational puzzle (solutions, part 1)

Posted on October 24, 2018 by Brent

About two and a half months ago I posted a challenge involving a sadistic math wizard, metal cubes containing rational numbers, and a room full of strange machines. I’ve been remiss in following up with some solutions. (Go read the … Continue reading →

Posted in arithmetic, challenges, logic, programming, puzzles, solutions | Tagged , , , , , , , , | 3 Comments

Quickly recognizing primes less than 1000: memorizing exceptional composites

Posted on October 15, 2018 by Brent

In my previous post I wrote about a procedure for testing the primality of any number less than : Test for divisibility by all primes up to , and also . (In practice I test for 2 and 5 first, … Continue reading →

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Quickly recognizing primes less than 1000: divisibility tests

Posted on October 11, 2018 by Brent

I took a little hiatus from writing here since I attended the International Conference on Functional Programming, and since then have been catching up on teaching stuff and writing a bit on my other blog. I gave a talk at … Continue reading →

Posted in arithmetic, computation, primes | Tagged , , , , | 3 Comments