Category Archives: computing

Getting to Know Julia

When I first started playing with computers, back in the Pleistocene, writing a few lines of code and watching the machine carry out my instructions was enough to give me a little thrill. “Look! It can count to 10!” Today, … Continue reading

Posted in computing | 12 Comments

Prime After Prime

Are the prime numbers sprinkled randomly along the number line, like windblown seeds?Of course not: Primality is not a matter of chance but a product of simple arithmetic. A number is prime if and only if no smaller positive integer … Continue reading

Posted in computing, featured, mathematics | 7 Comments

Where’s My Petabyte Disk Drive?

Fourteen years ago I noted that disk drives were growing so fast I couldn’t fill them up. Between 1997 and 2002, storage capacity doubled every year, allowing me to replace a 3 gigabyte drive with a new 120 gigabyte model. … Continue reading

Posted in computing | 37 Comments

The Bug That Ate Thursday

As I was finishing up the previous post here at, I noticed something off-kilter about the appearance of a few mathematical expressions. Here’s an enlarged example: Notice the spacing around the minus sign. It’s too close to the argument … Continue reading

Posted in computing | 5 Comments

Number Factoids

The web sites and dish up a smorgasbord of facts about every natural number from 1 to 999,999,999,999,999. Type in your favorite positive integer (provided it’s less than 1015) and you’ll get a list of prime factors, a … Continue reading

Posted in computing, mathematics | 5 Comments