[seqfan] Re: a(n+1) is the multiple of at least one digit of a(n)

Hans Havermann gladhobo at teksavvy.com
Tue May 28 21:03:53 CEST 2013


Conjecture: For nonnegative integer n, 2*10^n appears at index 2*10^n.


On May 28, 2013, at 10:46 AM, Eric Angelini <Eric.Angelini at kntv.be> wrote:

> I guess this is a permutation of the Naturals:
> 
> a(n+1) is the smallest integer not yet in the sequence such that
> a(n+1) is the multiple of at least one digit of a(n):
> 
> S=1,2,4,8,16,3,6,12,5,10,7,14,9,18,11,13,15,17,19,20,22,24,...



More information about the SeqFan mailing list