Re: [PrimeNumbers] Is the next one prime?
----- Original Message -----
From: "William F Sindelar" <w_sindelar@...>
Sent: Friday, January 04, 2002 7:04 PM
Subject: [PrimeNumbers] Is the next one prime?
> Hi Everybody
> I don't have the programs that can manipulate huge integers so I'm
> and burning with curiosity. Can anyone calculate the next term in the
> following sequence and check to see if it is prime, and if it is, then
> calculate the next one and check it for primality etc. Here is the
> 3, 19, 419, 176819, 31265489219, ...next one (is it prime?)
> The sequence is generated by using the expression (N^2+3N+1). Starting
> with N=3 we calculate 19, and it being prime we substitute 19 for N
> calculate again to obtain 419, etc.
f(31265489219)=977530816197201697619 is composite
> Another sequence starting with 29 is:
> 29, 929, 865829, 749662454729, ...
f(749662454729)=561993796032558961827629 is composite
You may like to download Primo.exe from http://www.znz.freesurf.fr/
Althought I use DERIVE (a symbolic calculus program) to answer your
Ignacio Larrosa Cañestro
A Coruña (España)