[seqfan] Re: UnitaryPhi

[rgwv at rgwv.com]

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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