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?

On Wednesday, May 15, 2013 8:07:48 PM UTC+8, John Cremona wrote:
>
> On 15 May 2013 10:47, John Cremona <[email protected] <javascript:>> 
> wrote: 
> > On 15 May 2013 10:25, Jeroen Demeyer <[email protected]<javascript:>> 
> wrote: 
> >> On 05/15/2013 10:57 AM, sea21 wrote: 
> >>> 
> >>> I see. Thanks for the correction! But when I typed in the right 
> syntax, 
> >>> I then encountered the error: 
> >>> 
> >>> *** at top-level: sage[9] = ellap(sage[7],sage[8] 
> >>> ***                                   ^---------------------- 
> >>> *** ellap: not enough modular polynomials 
> >> 
> >> 
> >> 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.  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. 
>
> John 
>
> > 
> > John 
> > 
> >> 
> >> 
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