[seqfan] Re: Is this right? smallest prime factor of smaller of amicable pair
Charles Greathouse
charles.greathouse at case.edu
Mon Aug 16 08:48:46 CEST 2010
It doesn't hold: 5480828320492525.
Charles Greathouse
Analyst/Programmer
Case Western Reserve University
On Mon, Aug 16, 2010 at 2:24 AM, T. D. Noe <noe at sspectra.com> wrote:
> At 11:14 PM -0700 8/15/10, Jonathan Post wrote:
>>2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2,
>>2, 2, 2, 2, 2, 2, 3, 2, 2
>>smallest prime factor of smaller of amicable pair
>>a(n) = A020639(A002025(n)) = Lpf(A002025(n)) = sigma(A002025(n))-A002025(n).
>>Must always be 2 or 3?
>
>
> It is true for all the terms in the b-file for A063990, which includes the
> larger of the amicable pair also.
>
> Tony
>
>
>
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