Logic Puzzle: What comes next?

What row of numbers comes next?

1
11
21
1211
111221
312211
13112221

Published 18 August 08 06:00 by Tom

Filed under: Microsoft, Trivia of the Day, Logic Puzzles

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# Thomas said on August 18, 2008 6:38 AM:

1113213211 :)

Wasnt that difficult... :)

# klu said on August 18, 2008 6:41 AM:

i think you are looking for:

1113213211

am i right? :)

# klu said on August 18, 2008 6:47 AM:

i think you are looking for

1113213211

am i right?

# James Taylor said on August 18, 2008 6:57 AM:

1113213211

your just reading the numbers

# Philipp Küng said on August 18, 2008 7:13 AM:

The next row could be: 13321211

# Tom said on August 18, 2008 8:15 AM:

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

# Osama said on August 18, 2008 8:28 AM:

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...

# Vadmyst said on August 18, 2008 9:05 AM:

11133211, pronunciation will make the trick :)

# 1 said on August 18, 2008 9:06 AM:

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

# Max said on August 18, 2008 9:18 AM:

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.

# Orry said on August 18, 2008 9:32 AM:

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

4111133122221

# rollie said on August 18, 2008 9:34 AM:

1113213211,

is this the answer?

# FelipeAngriman said on August 18, 2008 10:16 AM:

1211

111221

312211

13112221

1113213211

31131211131221

132113111231131122211

and so on...

# Bengan said on August 18, 2008 10:16 AM:

4 8 15 16 23 42

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

# Hermes Pessoa Neto said on August 18, 2008 11:49 AM:

Problem with my comment?

Post it againg:

The next row of numbers is 1113213111

# Michael De Winter said on August 18, 2008 12:10 PM:

1113213211 would be the next line.

# Casey Barton said on August 18, 2008 12:26 PM:

1113213211 (Apologies if this is a duplicate)

# Malkut said on August 18, 2008 1:32 PM:

1113213211 :)

next would be

31131211131221 ;)

# csjasnoch said on August 18, 2008 1:50 PM:

1113213211

*Key* Read it.. Don't count it....

# Kelcy Noel said on August 18, 2008 2:12 PM:

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

1113213211

# Kevin said on August 18, 2008 2:17 PM:

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...

# Zafi said on August 18, 2008 2:34 PM:

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

Looks simple, but difficult to work out!!

# Sascha said on August 18, 2008 2:47 PM:

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.

# Robert Johnston said on August 18, 2008 2:50 PM:

Next comes:

1113213211

31131211131221

13211311123113112211

11131221133112132113212221

Each line describes the one above.

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.

# Sampy said on August 18, 2008 5:07 PM:

1113213211

But I cheated and knew this one already. I'll leave the "why" to others :)

# Adam Wright said on August 18, 2008 8:19 PM:

The answer is 1113213211

Too easy!!!

adamjwright@comcast.net

# V.C. said on August 18, 2008 9:52 PM:

1113213211

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

# Avinash said on August 18, 2008 11:53 PM:

I think next number is 1122211331

# Mihai said on August 19, 2008 1:09 AM:

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

# klu said on August 19, 2008 2:33 AM:

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...

# Jonathan said on August 19, 2008 2:51 AM:

1113213211

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

# Eric Cartman said on August 19, 2008 3:39 AM:

One '1', One '3', Two '1', Three '2', One '1'

1113213211

# Md.Rukunuzzaman said on August 19, 2008 4:52 AM:

The next row will be 1113213211

# xklaus said on August 19, 2008 5:22 AM:

1113213211

31131211131221

13211311123113112211

# jinal said on August 19, 2008 6:54 AM:

1211

111221

312211

13112221

1113213211

# takepara said on August 19, 2008 7:37 AM:

1113213211

1-1

1-3

2-1

3-2

1-1

じゃない？

# Ozalp DONDUREN said on August 19, 2008 10:18 AM:

13112221

11311122211

11133122221

1111331122221

4133111222211

14113331222221

# Ali said on August 19, 2008 10:22 AM:

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

I think the logical next "number" is:

1113213211

# Vivek said on August 19, 2008 11:19 AM:

This is an oldie - 1113213211.

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

# Amit Pareek said on August 19, 2008 11:49 AM:

the next no will be 1113213211

# ASP.NET Debugging said on August 19, 2008 2:59 PM:

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

# Dave said on August 19, 2008 3:00 PM:

1211

111221

312211

13112221

413311221

Taking a while stab at this

# dco said on August 20, 2008 4:31 AM:

very nice puzzle!!

moar! :)

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