[seqfan] Pebble Transform and prime numbers
Eric Angelini
Eric.Angelini at kntv.be
Thu Nov 19 16:48:17 CET 2009
We could play the same game with the digits inside an integer...
Let's define the "Pebble Transform" (PT) like this:
--------------------------------------
Start with an integer (say '34102')
Define 'd' as the number of non-zero digits (here d=4)
Make every digit minus 1, except for the zero digits (34102
--> 23001)
Write 'd' ahead of the result (423001)
--------------------------------------
... and now iterate the PT until:
- the resulting integer has more zeros at the end than the one which
was used for the first PT;
- the resulting integer is a prime
Best,
É.
---
[Tanya K.]
> You have 45 pebbles arranged in several piles. Each turn you take one
> pebble from each pile and put them into a new pile.
>
> For example, if you start with one pile of 6, next step will be two
> piles: {1,5}, then {2,4} and so on. Eventually the sequence of partitions
> will start repeating itself.
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