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I am in need of classical eigenforms for $\Gamma_0(p)$.

In particular I need these to be newforms for each of the even weights 8 to 26 and would settle just for cases $p=2,3$ at this moment in time. I need them in a format from which I am able to find critical L-values.

Does anyone know where to find these and/or whether MAGMA/Maple/PARI is able to compute them? (The online documentation for MAGMA doesn't seem to mention commands for finding eigen-bases)

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    perhaps that Stein's [tables](http://modular.math.washington.edu/Tables/tables.html) or links at the end will help you...2012-07-22
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    William Stein's lectures [Explicitly Computing Modular Forms](http://modular.math.washington.edu/edu/2006/spring/583/book/current.pdf) could perhaps help you too (around page 50). [William Stein](http://modular.math.washington.edu) is maintaining Sage (that includes Pari/Maxima and other free software...)2012-07-22

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I think the best place to look might be the new "L-functions and modular forms database" website (still in beta at the moment). This has very detailed tables of modular forms, and, better still for your purposes, about their L-functions (critical values, first few zeros on the critical line, etc.); e.g. check out http://www.lmfdb.org/L/ModularForm/GL2/Q/holomorphic/7/4/0/a/ for lots of info about the L-function of the weight 4 level 7 eigenform.

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    Ok so I understand that when the dimension is 1 we can take any such cusp form as an eigenform but what is the best way to find eigenforms when the dimension of the space of new cuspforms is not 1?2012-07-23
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    I don't understand your question: the website has tables of new *eigenforms*.2012-07-23
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    It doesn't say that, unless I am missing something. It provides a table of new cusp forms.2012-07-23
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    Oh sorry I was being stupid, I realise that they are provided!2012-07-23
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    Do you know whether the labels given on that site can be used in MAGMA?2012-07-24