Ok...

[ksmith]

Someone either tell me how this works. If you try it, and it doesn't work for you, please comment.

I tried it twice, and the site guessed the right symbol both times. I recall once reading the explanation for sites like this, but I can't recall it at present.

http://www.dslextreme.com/users/exstatica/psychic.swf

Comments

[kristine-smith.livejournal.com]

I picked up on the symbol changes, but didn't delve any further.

As usual, knew there was an explanation, but maybe sorta wished there wasn't. Although a computer that could read my mind was just keep directing me to all the neat shopping sites, so maybe I'm glad it's all misdirection.

[(Anonymous)]

Taking a look at it, they've got the symbols arranged so that no matter what number you start out with, when you subtract the sum of the digits you get the same symbol.

99 - 18 = 81
98 - 17 = 81
97 - 16 = 81
81 - 9 = 72
80 - 8 = 72

The symbols repeat every nine numbers, I think.

SZ