[seqfan] Re: A169902: all ones(?)
andrew.weimholt at gmail.com
Sat Jul 10 06:03:21 CEST 2010
On Fri, Jul 9, 2010 at 7:37 PM, zak seidov <zakseidov at yahoo.com> wrote:
> May be it'd be more clearer:
> %N A169900 Earliest sequence such that a(i)*a(k) divides
> a((a(i)+a(k)) for all i>=1, k>=1
> but still this does not preclude from "all ones" case
> a(i)=1 for all i>=1
That's a completely different definition.
a(i)*a(k) | a(a(i)+a(k)) for all i>=1, k>=1
IS NOT THE SAME AS
i*k | a(i+k) for all i>=1, k>=1
The first definition (yours) allows for a sequence of all ones.
The second definition (mine) does not allow for a sequence of all ones.
i*k | 1 fails for i>1 or k>1
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