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A349649
Discriminants of real quadratic fields whose fundamental unit has norm 1.
2
12, 21, 24, 28, 33, 44, 56, 57, 60, 69, 76, 77, 88, 92, 93, 105, 120, 124, 129, 133, 136, 140, 141, 152, 156, 161, 165, 168, 172, 177, 184, 188, 201, 204, 205, 209, 213, 217, 220, 221, 236, 237, 248, 249, 253, 264, 268, 273, 280, 284, 285, 301, 305, 309, 312, 316
OFFSET
1,1
REFERENCES
D. A. Buell, Binary Quadratic Forms, Springer-Verlag, NY, 1989, pp. 92-93.
Paulo Ribenboim, My Numbers, My Friends: Popular Lectures on Number Theory, Springer-Verlag, NY, 2000, p. 151.
PROG
(PARI) isok(D) = isfundamental(D) && norm(quadunit(D))==1;
CROSSREFS
Cf. A003658, A003653 (discriminants of real quadratic fields whose fundamental unit has norm -1).
Cf. A003656, A327297 (a subsequence).
Sequence in context: A116700 A132132 A248378 * A327297 A371464 A199981
KEYWORD
nonn
AUTHOR
STATUS
approved