

A133675


Negative discriminants with form class number 1 (negated).


6



3, 4, 7, 8, 11, 12, 16, 19, 27, 28, 43, 67, 163
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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, WileyInterscience, 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



