On 15 May 2013 10:47, John Cremona <[email protected]> wrote:
> On 15 May 2013 10:25, Jeroen Demeyer <[email protected]> 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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