[seqfan] Re: A simple looking sequence is spontaneously breaking its monotony
Jack Grahl
jack.grahl at gmail.com
Tue Oct 26 10:28:25 CEST 2021
Do k1,k2, etc all have to be distinct? Or does it just happen to be the
case in the examples you showed?
On Tue, 26 Oct 2021, 09:09 Thomas Scheuerle via SeqFan, <
seqfan at list.seqfan.eu> wrote:
>
> Hi,
>
> An example how easy looking patterns are dangerous ..
>
> Some day in the future I will try to submit this sequence:
> 1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9 ...
> Without knowing its definition it looks a lot like floor(some function of
> n).
> Its definition:
> Split n into a sum n = k1+k2+..km such that a(n) =
> A001055(k1)+...A001055(km) becomes maximal.
> A001055(km) is the number of ways of factoring km with all factors
> greater than 1.
>
> There are yet two cases known to me where
> a(n+1) < a(n) this is at n = 52 and 76.
>
> There may be several sums for each n, which reach a(n), but some examples
> of the lexicographically earliest are found here:
>
> n = k1+k2+..+km A001055(k1)+...A001055(km) = a(n)
> n's for prefixes in the sum
>
> --------------------------------------------------------------------------------------------------------
> 1 = 1 1 = 1
> 2 = 2 1 = 1
> 3 = 1+2 1+1 = 2 1
> 4 = 1+3 1+1 = 2 1
> 5 = 1+4 1+2 = 3 1
> 6 = 1+2+3 1+1+1 = 3
> 1;3
> 7 = 1+2+4 1+1+1 = 4
> 1;3
> 8 = 1+3+4 1+1+2 = 4
> 1;4
> 9 = 2+3+4 1+1+2 = 4 2
> 10 = 1+2+3+4 1+1+1+2 = 5
> 1;3;6
> 11 = 1+4+6 1+2+2 = 5
> 1;5
> 12 = 1+2+4+5 1+1+2+1 = 5
> 1;3;7
> 13 = 1+2+4+6 1+1+2+2 = 6
> 1;3;7
> 14 = 1+3+4+6 1+1+2+2 = 6
> 1;4;8
> 15 = 1+2+4+8 1+1+2+3 = 7
> 1;3;7;
> 16 = 1+2+3+4+6 1+1+1+2+2 = 7
> 1;3;6;10
> 17 = 2+3+4+8 1+1+2+3 = 7
> 2;9
> 18 = 1+2+3+4+8 1+1+1+2+3 = 8
> 1;3;6;10
> 19 = 1+4+6+8 1+2+2+3 = 8
> 1;5;11
> 20 = 1+2+4+5+8 1+1+2+1+3 = 8
> 1;3;7;12
> 21 = 1+2+4+6+8 1+1+2+2+3 = 9
> 1;3;7;13
> 22 = 1+3+4+6+8 1+1+2+2+3 = 9
> 1;4;8;14
> 23 = 1+2+3+4+5+8 1+1+1+2+1+3 = 9
> 1;3;6;10
> ......
>
> kindest regards
>
> Thomas Scheuerle
>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
>
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