[seqfan] Re: UnitaryPhi
rgwv at rgwv.com
rgwv at rgwv.com
Sun Sep 2 16:24:35 CEST 2018
I will be up to 2*10^10 for a(20) in a few hours. Bob.
-----Original Message-----
From: SeqFan <seqfan-bounces at list.seqfan.eu> On Behalf Of zbi74583_boat at yahoo.co.jp
Sent: Saturday, 1 September, 2018 12:03 AM
To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
Subject: [seqfan] Re: UnitaryPhi
Hi Richard, Ami
Thanks for confirming and computing more terms
The result that a(12), a(14), a(15) are nice
I understood that a(20) is still interesting unknown problem
What number have you computed up to?
To compute RMPN mentally is easy Where RMPN is Rational Multiple Perfect Number such that Sigma(n)=k*n k is rational number
Yasutoshi
----- Original Message -----
> Cc:
> Date: 2018/9/1, Sat 00:58
> Subject: [seqfan] Re: UnitaryPhi
>
> In response to http://list.seqfan.eu/pipermail/seqfan/2018-August/018717.html:
>
> I get the same values for a(2)--a(11), a finite value for a(12), the
> same value for a(13) and a(16)-a(19), but smaller values for a(14),
> a(15):
>
> 12 64281600 [1, [[2, 10], [3, 4], [5, 2], [31, 1]]]
> 13 13 [1, [[13, 1]]]
> 14 84672 [1, [[2, 6], [3, 3], [7, 2]]]
> 15 129600 [1, [[2, 6], [3, 4], [5, 2]]]
> 16 16 [1, [[2, 4]]]
> 17 17 [1, [[17, 1]]]
> 18 518400 [1, [[2, 8], [3, 4], [5, 2]]]
> 19 19 [1, [[19, 1]]]
> 20 ??
> 21 254016 [1, [[2, 6], [3, 4], [7, 2]]]
>
> To clarify: (n-1)/n*m means (n-1)*m/n and UnitaryPhi = A047994.
>
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