[seqfan] Re: does 148 belong to A094612 ?

[wouter meeussen]

Max,

Eric's formula doesn't work in Mma 4.0,

this is strange. Mma 4.0 says:
"ClassList[d] gives a set of representatives of the equivalence classes
under composition of binary quadratic forms a*x^2+b*x*y+c*y^2 of
discriminant d. It is assumed that d is a negative square­free integer of
the form d=4k+1.

I understand that, at least, d should be negative, -d should be of the form
4*k+1 (k>=0),
and ***  ( -d)  should be squarefree   ***

                                                        detail, details,
always them details ...
Surely 148 is of a different species,

definitions might have changed over time,
and with the Higgs coming 'round the bend,
who knows what'll happen when maths finally turn fashion-aware,

Wouter.


----- Original Message ----- 
From: "Max Alekseyev" <maxale at gmail.com>
To: "SeqFan" <seqfan at list.seqfan.eu>
Sent: Wednesday, April 28, 2010 10:22 PM
Subject: [seqfan] does 148 belong to A094612 ?


> SeqFans,
>
> My PARI/GP claims that 148 must be an element of A094612:
>
> ? qfbclassno(148)
> %1 = 3
>
> Could somebody please check Mathematica code given there and see why
> 148 is missing.
>
> Thanks,
> Max
>
>
> _______________________________________________
>
> Seqfan Mailing list - http://list.seqfan.eu/
>
>
> __________ NOD32 5066 (20100427) Informatie __________
>
> Dit bericht is gecontroleerd door het NOD32 Antivirus Systeem.
> http://www.nod32.nl
>
>