Pick the right number and score big on this brainbusting 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
Code Crackers
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Question 1 of 11
1. Question
INSTRUCTIONS: Spot the pattern and pick the next number.90, 180, 270, 360, ___
Correct 1 / 1 PointsJust like skateboarding or BMX turns, each of these numbers grows by 90.
Incorrect / 1 PointsJust like skateboarding or BMX turns, each of these numbers grows by 90.

Question 2 of 11
2. Question
1, 1, 2, 3, 5, 8, __
Correct 1 / 1 PointsThis is the start of the famous Fibonacci number sequence. (Believe it or not, there are famous numbers.) Each number is the sum of the two that come before it. 0 + 1 = 1; 1 + 1 = 2; 1 + 2 = 3; and so on.
Incorrect / 1 PointsThis is the start of the famous Fibonacci number sequence. (Believe it or not, there are famous numbers.) Each number is the sum of the two that come before it. 0 + 1 = 1; 1 + 1 = 2; 1 + 2 = 3; and so on.

Question 3 of 11
3. Question
2, 4, 6, 8, 10, ____
Correct 1 / 1 PointsAn easy one. Just pick the next even number.
Incorrect / 1 PointsAn easy one. Just pick the next even number.

Question 4 of 11
4. Question
2, 4, 8, 16, 32, ___
Correct 1 / 1 PointsThe pattern is powers of two. 21 = 2; 22 = 4; 23 = 8; etc.
Incorrect / 1 PointsThe pattern is powers of two. 21 = 2; 22 = 4; 23 = 8; etc.

Question 5 of 11
5. Question
8, 27, 64, 125, 216, ____
Correct 1 / 1 PointsHope you were thinking exponentially– these are all cubes. 23 = 8; 33 = 27; 43 = 64.
Incorrect / 1 PointsHope you were thinking exponentially– these are all cubes. 23 = 8; 33 = 27; 43 = 64.

Question 6 of 11
6. Question
2, 3, 5, 7, 11, 13, ___
Correct 1 / 1 PointsThe next prime number– that is, one thats only evenly divisible by itself and one– is 17.
Incorrect / 1 PointsThe next prime number– that is, one thats only evenly divisible by itself and one– is 17.

Question 7 of 11
7. Question
1, 2, 4, 7, 11, 16, ___
Correct 1 / 1 PointsIn this sequence, the numbers grow by one, then two, then three, and so forth. 1 + 1 = 2; 2 + 2 = 4; 4 + 3 = 7.
Incorrect / 1 PointsIn this sequence, the numbers grow by one, then two, then three, and so forth. 1 + 1 = 2; 2 + 2 = 4; 4 + 3 = 7.

Question 8 of 11
8. Question
1, 4, 9, 16, 25, ___
Correct 1 / 1 PointsEach number is a square– the total you get when you multiply a number times itself: 1 x 1 = 1; 2 x 2 = 4, 3 x 3 = 9.
Incorrect / 1 PointsEach number is a square– the total you get when you multiply a number times itself: 1 x 1 = 1; 2 x 2 = 4, 3 x 3 = 9.

Question 9 of 11
9. Question
10, 21, 32, 43, 54, ___
Correct 1 / 1 PointsEach number grows by 11.
Incorrect / 1 PointsEach number grows by 11.

Question 10 of 11
10. Question
3, 1, 4, 1, 5, ___
Correct 1 / 1 PointsTrick question: These are the first few digits of pi: 3.14159.
Incorrect / 1 PointsTrick question: These are the first few digits of pi: 3.14159.

Question 11 of 11
11. Question
BONUS QUESTION:6, 28, 496, 8128, 33550336, ___________
Correct 1 / 1 PointsWhats so special about these numbers? Theyre perfect. That is, theyre equal to the sum of all the smaller numbers that divide them. You can divide six equally by one, two and three, and 1 + 2 + 3 = 6. There are only about 30 known perfect numbers.
Incorrect / 1 PointsWhats so special about these numbers? Theyre perfect. That is, theyre equal to the sum of all the smaller numbers that divide them. You can divide six equally by one, two and three, and 1 + 2 + 3 = 6. There are only about 30 known perfect numbers.
That was pretty hard.
That was easy
OMG that was so easy but then hard lol
that was kinda hard
that was tricky
this was easy until i started to get to eager <3 Jade Orr
the only hard one was the bonus
7 out of 11… tricky
tricky…
10 out of 10 booooyyyy
there’s eleven questions…
edgar was here