[seqfan] Re: Mystery tour with a(n)=sigma(a(n-1))

[Richard Guy]

Many thanks for this, but I didn't get either
reference to come up, and when I accessed your
programs, I didn't see anything relevant.
Please excuse my incompetence.   R.

On Wed, 17 Feb 
2010, Richard 
Mathar wrote:

> Under the map of n -> sigma(n)-n = A001065(n) the primes all flush into 1,
> so there are two graphs, one with the 1, too crowded in some sense,
> http://www.strw.leidenuniv.nl/~mathar/progs/nToAlisigofn.ps
> and one without
> http://www.strw.leidenuniv.nl/~mathar/progs/nToAlisigofn2.ps
>
> Richard Mathar
>
>
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