Thank you all for your prompt responses! It works fine for me now! =) It 
would definitely be useful to have an optional Sage package for this. 

On Thursday, May 16, 2013 1:45:07 AM UTC+8, leif wrote:
>
> sea21 wrote: 
> > Thanks for all the helpful replies! I understand the problem now. How do 
> > I install the full seadata package if I am using the Windows version of 
> > Sage on Virtual Box? 
>
> I don't know what the (Linux distribution of the) ova ships with, and 
> depends on whether you at all have internet access from the virtual 
> machine. 
>
> Just download 
> http://pari.math.u-bordeaux.fr/pub/pari/packages/seadata.tgz (probably 
> from Windows), copy the file into some temporary directory in your 
> virtual machine, start a shell and change to that directory, and there do 
>
> $ tar xzf seadata.tgz  # extract the GNU-zip-compressed tar 
> $ cp data/seadata/* "$SAGE_ROOT"/local/share/pari/seadata/ 
> $ rm -rf data/ 
>
> where $SAGE_ROOT is what 
>
> sage: print SAGE_ROOT 
>
> gives, the "root" of your Sage installation. 
>
> (You can of course delete seadata.tgz afterwards as well.) 
>
>
> Would it be worth providing an optional Sage package for this, for 
> convenience?  (It would also be slightly smaller than PARI's .tgz ...) 
>
>
> -leif 
>
>
> > On Wednesday, May 15, 2013 8:07:48 PM UTC+8, John Cremona wrote: 
> > 
> >     On 15 May 2013 10:47, John Cremona <[email protected] 
> >      >> The PARI package in Sage only has the "small" database of 
> modular 
> >      >> polynomials, suitable for primes up to about 350 bits. You would 
> >     need the 
> >      >> full seadata database. 
> >      > 
> >      > See http://pari.math.u-bordeaux.fr/packages.html 
> >     <http://pari.math.u-bordeaux.fr/packages.html>.  It should be easy 
> >      > to download that and put it in the right place in the Sage 
> >      > installation, which is SAGE_ROOT/local/shar/pari.  There is 
> already 
> >      > the seadata in there but as Jeroen says, it is the small version. 
> > 
> >     I tested this.  AFter putting the large seadata files into that 
> >     place the code 
> > 
> >     sage: p 
> >     
> 10566623376041669505825220895462627801380145726624712771836144280024219722297939525451022774579043146020265329009462778097121538072213487555318041328039599
>  
>
> > 
> >     sage: a4 
> >     
> 6557325753041215216697541661243177462316789827714644669153173743634615853451990973713919498189870050066222585898470391225455349541996119434962754618249308
>  
>
> > 
> >     sage: a6 
> >     
> 3887529832007272230349363633177495741990999092935596186265775681498612008751646149414901742385996951003068331698140100902826619262789957720578797201032523
>  
>
> > 
> >     sage: E = gp.ellinit([0,0,0,a4,a6]) 
> >     sage: sage: ap = E.ellap(p) 
> > 
> >     runs fine. 
>
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