[seqfan] Re: Integers formed by concatenating primes

[zak seidov]

--- On Sat, 10/17/09, Hagen von Eitzen <hagen at von-eitzen.de> wrote:

> From: Hagen von Eitzen <hagen at von-eitzen.de>
> Subject: [seqfan] Re: Integers formed by concatenating primes
> To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
> Date: Saturday, October 17, 2009, 8:35 AM
> Michael Porter schrieb:
> > I have a newbie question: how does a potential author
> (me) determine if a sequence is "important enough" to
> include in the database?  Are there guidelines? 
> Has a sequence ever been deleted because it's uninteresting
> or spam-like?
> >   
> The database will never contain more than only finitely
> many out of 
> countably many describable and continuum-many possible
> sequences, so 
> restricting oneself by some kind of guideline seems
> appropriate.
> A possible guideline might be: If you discover the sequence
> just because 
> you are activlely looking for/making up sequences that are
> not in OIES, 
> then it may indeed have not enough merits to be included.
> :)

Exactly what I thought and expressed (finitely) many times!!

Look, right now we read:

Last modified October 16 12:42 EDT 2009. 
Contains 164517 sequences. 

If you apply, "transformation", say, 
 (Ax)^2+Ax+41 
for all 164517 sequences
you'll easily get another 
164516 NEW sequences 
(with no more than, say, 10 dupes);-))

Zak

> 

> Hagen
>