S_{3,1}
Max
maxale at gmail.com
Sun Feb 19 15:36:08 CET 2006
Yasutoshi,
I cannot reproduce your result. For example,
? S(n) = if(n>0,sigma(n),-sigma(-n))-3*n
? m=1248;for(k=1,4,print1(" ",m);m=S(m));print(" ",m)
1248 -216 48 -20 18
So, S(S(S(S(1248))))=18.
Why then 1248 belongs to the sequence below?
Max
On 2/14/06, koh <zbi74583 at boat.zero.ad.jp> wrote:
> [Definition of {k.l}-Aliquot sequence]
> Let S(n)=Sigma(n)/l-k*n
> a_{m}=S(a_{m-1})
>
> This is a sequence related with {3,1}-Aliquot.
>
> Yasutoshi
>
>
>
> %I A000001
> %S A000001 1248, 1596, 28272, 30240, 32760
> %N A000001 Let S(n)=Sigma(n)-3*n .
> Numbers such that S(S(S(S(n))))=n, {3,1}-Sociable number of order 1 or 2 or 4. .
> %C A000001 Each cycle has some negative integers as members.
> If n is a negative integer then Sigma(n)=-Sigma(-n) .
> Orders of each cycle are 2,2,2,1,1
> %H A000001 <a href="http://mathworld.wolfram.com/SociableNumbers.html">WathWorld</a>
> %Y A000001 A113285
> %K A000001 none
> %O A000001 1,1
> %A A000001 Yasutsohi Kohmoto zbi74583 at boat.zero.ad,jp .
>
>
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