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A003653 Discriminants of quadratic fields whose fundamental unit has norm -1.
(Formerly M3781)
0
5, 8, 13, 17, 29, 37, 40, 41, 53, 61, 65, 73, 85, 89, 97, 101, 104, 109, 113, 137, 145, 149, 157, 173, 181, 185, 193, 197, 229, 232, 233, 241, 257, 265, 269, 277, 281, 293, 296, 313, 317, 328, 337, 349, 353, 365, 373, 389, 397, 401, 409, 421, 424, 433, 445, 449 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..56.

CROSSREFS

Sequence in context: A314432 A314433 A314434 * A003655 A082823 A143747

Adjacent sequences:  A003650 A003651 A003652 * A003654 A003655 A003656

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mira Bernstein

STATUS

approved

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Last modified January 16 15:53 EST 2019. Contains 319195 sequences. (Running on oeis4.)