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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,387

Treated the last one like a weak composition, it worked well.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

Hi meanmaths

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,387

Hi;

You can use the recursive form:

a[n] = 2 a[n - 1] + a[n - 2] - 2 a[n - 3] - a[n - 4]

with

a[0] = 0

a[1] = 1

a[2] = 3

a[3] = 8

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**meanmaths****Member**- Registered: 2013-08-01
- Posts: 51

Sorry for the late reply.

Great work. If you feel like it, you may try to combine, for your own fun, the different problems (reverse, noise, 1-2 or 1-3 digits for a first split) but you already solved my problems (I will finish the rest later).

And take a look @ the game (Mean Sumurai @ Google Play). If you don't have an Android, the iOS version will be out this month. I want this "number splitting" thing to have some visibility.

It's been great interacting with you guys. Very gifted guys, that's what you are. Thanks again.

... ... this post is starting to sound like I'm going away. I'm still a member of this forum, darn it :-D

I'm sticking around :-). If you have any questions, follow-ups, suggestions, I'll be happy to hear them.

Best,

Number Splitter #1

GameMaster of Mean Sumurai @ Google Play

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,387

Hi;

Thanks for the problems I had a good time working on them.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

**Online**