# Logic Puzzle: What comes next?

What row of numbers comes next?

1
11
21
1211
111221
312211
13112221

1. Thomas says:

1113213211 π

Wasnt that difficult… π

2. klu says:

i think you are looking for:

1113213211

am i right? π

3. klu says:

i think you are looking for

1113213211

am i right?

4. James Taylor says:

1113213211

5. The next row could be: 13321211

6. Tom says:

Yeah,

This is the only logic post you have had so far that I remember the from high school.

Each number tells the count of each number count in the sequence.

So just group the numbers by count

(1)1’s – (1)3’s – (2)1’s – (3)2’s – (1)1’s

1113213211

7. Osama says:

1113213211

i think that each number describe the previous number (only in numbers )

example.. 2nd row = one 1

3d row = two 1

4th row = one 2 one 1 etc…

11133211, pronunciation will make the trick π

9. 1 says:

1113213211 … the sequence is: 1, 11 (or one 1), 21 (two 1’s), 1211 (one 2, one 1), etc.

10. Max says:

This series is good one. It describes the number of digits in the previous sequence by just using numbers. So for the last sequence, we have:

One 1, One 3, Two 1s, Three 2s and One 1

=> 11,13,21,32,11.

Hope I didn’t miss any.

11. Orry says:

It’s too early for this kind of thing, but for the sport, let’s give it a try…

4111133122221

12. rollie says:

1113213211,

13. FelipeAngriman says:

1

11

21

1211

111221

312211

13112221

1113213211

31131211131221

132113111231131122211

and so on…

14. Bengan says:

4 8 15 16 23 42

(or was it 11 13 21 32 11? can’t remember really)

15. Problem with my comment?

Post it againg:

The next row of numbers is 1113213111

16. Michael De Winter says:

1113213211 would be the next line.

17. Casey Barton says:

1113213211 (Apologies if this is a duplicate)

18. Malkut says:

1113213211  π

next would be

31131211131221   π

19. csjasnoch says:

1113213211

*Key* Read it.. Don’t count it….

20. Kelcy Noel says:

Hi each row is counting the amount of number from the previous row.

1113213211

21. Kevin says:

1113213211

the numbers describe the previous number.  The first number "1" is described as "one 1" = 11

second "11" is described as "two 1s" = 21

etc…

22. Zafi says:

I guess it is- 311133211. This time I’m not confident.

Looks simple, but difficult to work out!!

23. Sascha says:

This is an easy one! All it does is count the number of digits from the previous row like this:

1 = start

11 = the previous row had 1 times 1

21 = the previous row had 2 times 1

1211 = the previous row had 1 times 2 followed by 1 times 1

etc.

Which means that after 13112221 comes this:

1113213211 = the previous row had 1 times 1 followed by one times 3 follows by 2 times 1 follow by 3 times 2 followed by 1 times 1.

24. Next comes:

1113213211

31131211131221

13211311123113112211

11131221133112132113212221

Each line describes the one above.

1

11 (One 1)

21 (Two 1s)

1211 (One 2, one 1)

111221 (One 1, one 2, two 1s)

312211 (Three 1s, two 2s, one 1)

And so on.

25. Sampy says:

1113213211

But I cheated and knew this one already. I’ll leave the "why" to others π

Too easy!!!

27. V.C. says:

1113213211

one 1, one 3, two 1, three 2, one 1

28. Avinash says:

I think next number is 1122211331

29. Mihai says:

This thing is so oooold. We were playing it when we were in junior high. Although it might have been sooner.

1113213211

one one one three two ones three twos one one

30. klu says:

i’m going to give it one more try…

1113213211

i don’t know what’s wrong with your blog, but it’s simply a pain to have a comment submitted…

31. Jonathan says:

1113213211

each row describes the prevous row in terms of the count of sequential (horizontal) digits.

32. Eric Cartman says:

One ‘1’, One ‘3’, Two ‘1’, Three ‘2’, One ‘1’

1113213211

33. Md.Rukunuzzaman says:

The next row will be 1113213211

34. xklaus says:

1113213211

31131211131221

13211311123113112211

35. jinal says:

1

11

21

1211

111221

312211

13112221

1113213211

36. takepara says:

1113213211

1-1

1-3

2-1

3-2

1-1

γγγͺγοΌ

37. 13112221

11311122211

11133122221

1111331122221

4133111222211

14113331222221

38. Ali says:

Hehe, you just reminded me with those online hackquest games, good old times!

I think the logical next "number" is:

1113213211

39. Vivek says:

This is an oldie – 1113213211.

Each number describe the previous one, e.g. 111221 is read "one 1, one 2, two 1’s".

40. Amit Pareek says:

the next no will be 1113213211

41. Here is my answer to the puzzle that was posted here . Count the number of occurrences of a particular

42. Dave says:

1

11

21

1211

111221

312211

13112221

413311221

Taking a while stab at this

43. dco says:

very nice puzzle!!

moar! π