[seqfan] Re: A046790, A046791 obscure, need clarification

Vladimir Shevelev shevelev at bgu.ac.il
Tue Jun 7 00:12:02 CEST 2016


David wrote:

>A046791(n): Squarefree bit of 
>A046790(n) multiplied by 4 if A046790(n) is
>divisible by 4. 

A correction: Squarefree bit of A046790(n) which
is multiplied by 4 only if A046790(n) is even, but
its squarefree bit is odd.

For example, 1)A046790(5)=24, squarefree bit is even,
so A046791(5) = 6; 
2)A046790(12)=48,  squarefree bit is odd (3), so
A046791(12)=3*4=12.

Regards,
Vladimir

________________________________________
From: SeqFan [seqfan-bounces at list.seqfan.eu] on behalf of David Corneth [davidacorneth at gmail.com]
Sent: 06 June 2016 19:33
To: Sequence Fanatics Discussion list
Subject: [seqfan] Re: A046790, A046791 obscure, need clarification

Hi all,

Using Vladimir's definition, we can say that terms of A046790 are numbers
of the form k*p^2 for some odd prime p and integer k or 8*k for some
integer k.
A046791(n): Squarefree bit of A046790(n) multiplied by 4 if A046790(n) is
divisible by 4.

Best,
David

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