

A329182


Negative discriminants with form class group isomorphic to C_2 X C_2 (negated).


2



84, 96, 120, 132, 160, 168, 180, 192, 195, 228, 240, 280, 288, 312, 315, 340, 352, 372, 408, 435, 448, 483, 520, 532, 555, 595, 627, 708, 715, 760, 795, 928, 1012, 1435
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OFFSET

1,1


COMMENTS

This sequence is finite and this is the full list.


LINKS

Table of n, a(n) for n=1..34.
Rick L. Shepherd, Binary quadratic forms and genus theory, Master of Arts Thesis, University of North Carolina at Greensboro, 2013


PROG

(PARI) isA329182(d) = (d>0) && quadclassunit(d)[2]==[2, 2]


CROSSREFS

Cf. A014602 (negative discriminants with form class group isomorphic to the trivial group), A133675 (isomorphic to C_2), A328825 (isomorphic to C_3), this sequence (isomorphic to C_2 X C_2), A330219 (isomorphic to C_4).
The fundamental terms are listed in A192322. Cf. also A013658.
Sequence in context: A045569 A219183 A289218 * A113931 A214866 A111313
Adjacent sequences: A329179 A329180 A329181 * A329183 A329184 A329185


KEYWORD

nonn,fini,full


AUTHOR

Jianing Song, Dec 05 2019


STATUS

approved



