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A322710 Negative discriminants with form class number 2 (negated). 1
15, 20, 24, 32, 35, 36, 40, 48, 51, 52, 60, 64, 72, 75, 88, 91, 99, 100, 112, 115, 123, 147, 148, 187, 232, 235, 267, 403, 427 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This is the full sequence.

The j-invariants for these discriminants are quadratic integers. See the links below for a full list.

LINKS

Table of n, a(n) for n=1..29.

Rick L. Shepherd, Binary quadratic forms and genus theory, Master of Arts Thesis, University of North Carolina at Greensboro, 2013

Jianing Song, j-invariants for the discriminants with form class number 2 and their Hilbert class polynomials

Eric Weisstein's World of Mathematics, Class Number

PROG

(PARI) for(n=1, 500, if((-n)%4<=1&&quadclassunit(-n)[1]==2, print1(n, ", ")))

CROSSREFS

Cf. A014603, A133675, A305474.

Sequence in context: A214410 A102495 A133288 * A316743 A014603 A070222

Adjacent sequences:  A322707 A322708 A322709 * A322711 A322712 A322713

KEYWORD

nonn,fini,full

AUTHOR

Jianing Song, Dec 24 2018

STATUS

approved

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Last modified May 27 13:00 EDT 2020. Contains 334657 sequences. (Running on oeis4.)