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number puzzles (quite hard!)

Forums: Riddles
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echoecho5678
 
Reply Tue 15 Dec, 2009 10:23 am
my first riddle is...
what is the next number in the sequence?
1
11
21
1211
111221
312211
13112221
1113213211

this took me quite a while to figure out!
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DrewDad
 
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Reply Tue 15 Dec, 2009 10:41 am
@echoecho5678,
31131211131221
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contrex
 
  1  
Reply Tue 15 Dec, 2009 01:44 pm
Quote:
31131211131221


After that is
13211311123113112211

The way it looks to me is that you start with one, and each number after that "describes" the previous one.

thus
1
11 ("one one")
21 ("two ones")
1211 (one two, one one)
111221 (one one, one two, two ones)

etc

It seems to fit because Drewdad got the same as me.
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