# [seqfan] Re: UnitaryPhi

zbi74583_boat at yahoo.co.jp zbi74583_boat at yahoo.co.jp
Sat Sep 1 06:03:13 CEST 2018

```    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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>

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