http://www.irregularwebcomic.net/1666.html

You know what?

I was just looking at this comic and wondering what the heck I could write for an annotation... and it only just occurred to me that this
comic makes a reference to Hell, and it's numbered 1666, a thousand plus 666, the traditional
number of the beast.

So no, that wasn't deliberately planned. I don't generally do things to tie the comic in with the comic number. I have, on occasion, but I try
not to make a habit of it.

**2018-01-06 Rerun commentary:** 666 is quite an interesting number, mathematically speaking.
It's the sum of the first 36 natural numbers (1 + 2 + 3 + 4 + ... + 36 = 666), making it the 36th

triangular number. It's also the sum of the squares of the 5th and 6th triangular numbers, 15 and 21 (15

^{2} + 21

^{2} = 666), and 15 and 21 themselves sum to give 36.
666 is also the sum of the squares of the first seven prime numbers: 2

^{2} + 3

^{2} + 5

^{2} + 7

^{2} + 11

^{2} + 13

^{2} + 17

^{2} = 666.
This isn't particularly astonishing though, since pretty much every number has some wacky mathematical properties that look amazing, until you realise that all numbers have similar things.