Today's puzzle

[sinjun]

Since I posted yesterday's earlier, here's the one on my calendar for today:

Find the number that best completes the sequence below.

1 4 16 ? 256

Comments

Re:

[flashfire.livejournal.com]

I still like the multiplier of 9 rule. No matter what number you take, no matter how large or small, you can multiply it by 9 and the total sum of all those numbers will always equal 9 once you've added them together.

To wit:

Key in a random number: 7,545,154,872,145 x 9 = 67,906,393,849,305. Add each of those numbers up and you get 72, and 7 + 2 = 9.

Of course, this was demonstrated in a simpler manner by just taking things like 5 x 9 = 45, and 4 + 5 = 9. ;-)

Re:

[wibbble]

That same rule works for multiples of three, too, except that it's either three or a multiple of three (ie, six or nine).