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1, 11, 21, 1211, 111221 etc
six7s Started conversation Mar 24, 2004
Hi there,
You mentioned that you hadn't seen this sequence before...
How it works is shown in between the 5th and 6th 
(there are 10 altogether) so DON'T scroll down to the _middle_ of this post if you want to work it out yourself 
Although I recognise the sequence, I have aboslutely no idea if/how it could be 'predicted' by a formula 
I think it has something to do with primes...
Anyhoo...
1
2
3
4
5
OK...
1
11
21
1211
111221
Each line describes the preceeding line (apart from the 1st line of course as it doesn't have a preceeding line 
)
line 1: Start with 1
line 2: 1 one (or 11)
line 3: 2 ones (or 21)
line 4: 1 two and 1 one (or 1211)
line 5: 1 one, 1 two and 2 ones (or 111221)
etc
6
7
7
8
9
10
1, 11, 21, 1211, 111221 etc
MuseSusan Posted Mar 24, 2004
Wow, that's very clever! Okay, now on to working out a formula… (I'll have to think about it for a while, but you can bet I'll be thinking about this when I SHOULD be doing other things .)
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1, 11, 21, 1211, 111221 etc
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