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A133675 Negative discriminants with form class number 1 (negated). 6
3, 4, 7, 8, 11, 12, 16, 19, 27, 28, 43, 67, 163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The list on p. 260 of Cox is missing -12, the list in Theorem 7.30 on p. 149 is correct. - Andrew V. Sutherland, Sep 02 2012

REFERENCES

D. A. Cox, Primes of the form x^2+ny^2, Wiley, New York, 1989, pp. 149, 260.

D. E. Flath, Introduction to Number Theory, Wiley-Interscience, 1989.

LINKS

Table of n, a(n) for n=1..13.

PROG

(PARI) ok(n)={(-n)%4<2 && quadclassunit(-n).no == 1} \\ Andrew Howroyd, Jul 20 2018

CROSSREFS

Cf. A014602.

Sequence in context: A107819 A300950 A067186 * A173467 A050122 A179016

Adjacent sequences:  A133672 A133673 A133674 * A133676 A133677 A133678

KEYWORD

fini,full,nonn,nice

AUTHOR

N. J. A. Sloane, May 16 2003

EXTENSIONS

Corrected by David Brink, Dec 29 2007

STATUS

approved

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Last modified January 15 20:47 EST 2019. Contains 319184 sequences. (Running on oeis4.)