mathematiczZz 2

1
11
21
1112
3112
211213

So what i need is the number which comes under 211213 , with explanation plz <3 Thx!
Comments
25
dit gaan mn hoofd ook net iets te boven :p
Parent
Each number in the sequence is actually counting the digits that were present in the last number in the sequence. Starting with 1, the next number is 11, or (one one). Then we have 21, which is "Two one(s)", since 11 has two ones in it. 21 has one 1 and one 2, so the next number is 1112.
Following this pattern, the next 5 numbers are:
{...312212, 213223, 113223, 212223, 114213, ...}
312213

There are 3 ones, 2 twos and 1 three in the previous line, hope you can see the pattern.
And why is that 1 between the 3 & the 2's then ? :o
Parent
Ok, step-by-step ;)

You've got 211213 in the last line you wrote. In this line you have three ones (on second, third and fifth position), two twos (1st and 4th) and one three (6th). Using this information, you create the next element of the sequence, presenting the number of particular digits in the previous element. Hence, you have 31 (three ones), 22 (two twos), 13 (one three), which gives 312213.
Parent
311213

just count the number of "1" from the previous number; the rest is pretty clear
You can't count.
Parent
there's a fault anyway Oo :D
ik heb geen zin om na mijn intensieve toetsweek over zoiets te denken. (heb ik eigenlijk nooit als het wiskunde betreft)\

geef als antwoord 1337 dan is t altijd goed
3454858415455555555555555421654853454858415455555555555555421654853454858415455555555555555
think so
Alles met cijfertjes stinkt!
just speak the numbers out loud, you'll see the solution then =)

EDIT1: Then you need to put it in some kind of order: like first the 1's, then the 2's and then the 3's

EDIT2: You need to put the double numbers in first (before my EDIT 1 :P )

EDIT3: now it's weird :/
1
11
21
1112
3112
211213
312213
212223
114213
31121314
41122314
31221324
21322314
21322314
... Converge
3112
132112
1113122112
311311222112
13211321322112

How the hell did you end up with the sequence you have? :x
Parent
From the previous line, count the number 1's, then the number of 2's, then the number of 3's...

Could be your way tho, both cud be the algorithm they are looking for.

Who knows.
Parent
But in your algorithm, your saying that 21 should be: 1211, however from the sequence given in the question, the next line should indeed be 1112. Same applies with 3112.
Parent
If you look at it your way, you're right. Doesn't really make sense though. Look at this bit for example:

21
1112
3112

The first line has one 2, and one 1. The next bit in the sequence we got taught at school for no apparent reason would be 1211, because you count from left to right and that's basically what it says. The next line in their sequence however, goes from right to left for a reason I don't understand. The third however, goes from left to right again.

Perhaps I'm missing an obvious pattern, but it's just different from what I've seen before. :o)
Parent
1337,

haha
1337
112317
31121317
41122317
3122131417
4122231417
3132132417
3122331417
3122331417
... Converge
Parent
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