[seqfan] Re: A046452

Harvey P. Dale hpd at hpdale.org
Fri Jan 4 21:17:05 CET 2013


Graeme:
	Then would this definition work: "Numbers n with three prime factors such that the concatenation of those prime factors is a palindrome"?
	And why are the numbers I mentioned in my earlier email (below) not in the current sequence?
	Best,
	Harvey
 

-----Original Message-----
From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Graeme McRae
Sent: Friday, January 04, 2013 3:04 PM
To: Sequence Fanatics Discussion list
Subject: [seqfan] Re: A046452

Because the elements a(n) of sequence A046452 have nothing to do with n.
 It's just a list of numbers, a(n), satisfying the property.  I agree with you, though, that the word "composite" is superfluous.

--Graeme McRae
Palmdale, CA


On Fri, Jan 4, 2013 at 11:58 AM, Harvey P. Dale <hpd at hpdale.org> wrote:

>             I believe I am misunderstanding something about the above 
> sequence.  Why aren't these numbers in the sequence: 3729, 28609, 
> 28847, 28951, 29729, 29829?  And why does the definition read, 
> "Concatenation of the 3 prime factors of composite a(n) is a 
> palindrome," rather than "Concatenation of the 3 prime factors of n is a palindrome"?
>             Clarification would be appreciated.
>             Best,
>             Harvey
>
> _______________________________________________
>
> Seqfan Mailing list - http://list.seqfan.eu/
>

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