Code Crackers

Updated: June 10, 2008

By Stephanie L. Smith

Pick the right number and score big on this brain-busting game.

The "Lost" castaways are followed by the mysterious sequence-- 4, 8, 15, 16, 23, 42-- and they're not alone. You're about to face off with 11 mysterious sequences of your own. If you can spot the pattern, you can crack the code-- and maybe even pick up a trick or two that'll boost your ACT math score.

Source: The Online Encyclopedia of Interger Sequences