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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 29 20:22 EDT 2020. Contains 337432 sequences. (Running on oeis4.)