Logic Puzzle: What comes next?


What row of numbers comes next?

1
11
21
1211
111221
312211
13112221

Comments (43)

  1. Thomas says:

    1113213211 🙂

    Wasnt that difficult… 🙂

  2. klu says:

    i think you are looking for:

    1113213211

    am i right? 🙂

  3. klu says:

    i think you are looking for

    1113213211

    am i right?

  4. James Taylor says:

    1113213211

    your just reading the numbers

  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…

  8. Vadmyst says:

    11133211, pronunciation will make the trick 🙂

  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,

    is this the answer?

  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  đŸ™‚

    next would be

    31131211131221   😉

  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 🙂

  26. Adam Wright says:

    The answer is 1113213211

    Too easy!!!

    adamjwright@comcast.net

  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.

    The answer should be

    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

    じゃăȘă„ïŒŸ

  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! 🙂