[seqfan] Re: A174397 and primes with negative value.
Jonathan Post
jvospost3 at gmail.com
Fri Mar 19 18:27:05 CET 2010
"A prime number (or prime integer, often simply called a "prime" for
short) is a positive integer p>1 that has no positive integer divisors
other than 1 and p itself. (More concisely, a prime number p is a
positive integer having exactly one positive divisor other than
1.)..."
http://mathworld.wolfram.com/PrimeNumber.html
I can see that -2 is a prime in Z, as it is only divisible by itself,
the unit -1, and the positive prime 2. But that requires tweaking the
initial definition to substitute "unit" for "1."
On Fri, Mar 19, 2010 at 10:16 AM, Richard Mathar
<mathar at strw.leidenuniv.nl> wrote:
>
> V. Orlovsky is defending his definition in A174397 (with negative numbers,
> obviously) with a link to http://primes.utm.edu/notes/faq/negative_primes.html
> arguing that primes can be negative numbers, so the mention of absolute
> values in the definition is not needed. I cannot make friend with that idea.
> Is there a general consensus (at least within the OEIS) that primes are >=2 ?
>
> Richard Mathar
>
>
> _______________________________________________
>
> Seqfan Mailing list - http://list.seqfan.eu/
>
More information about the SeqFan
mailing list