[mikehawkins]

Same here - I was also guilty of feeling a bit clever and avoiding the obvious "oh, the numbers double every time" answer. So, when I found out that if the spelling of each number was one letter longer (4 = four letters, 8 = five letters, 11 = six) I got smug, and didn't bother testing further.

Good article - and a humbling experience. :)

[TylerE]

I went for the slightly more clever "series of powers" after 3/9/27 validated.

[dllthomas]

That was a hypothesis I considered, as was x,2x,4x. Invalidated both of those, and ultimately drew the intended conclusion (which is not quite "correct", given javascript numeric precision issues).