I was curious about this, but it looks like the links to crazybob.org now 404. It seems to me like the trick would be to find a way to generate, in order, the

I was curious about this, but it looks like the links to crazybob.org now 404. It seems to me like the trick would be to find a way to generate, in order, the numbers you can't print, then you just print the gaps between them.