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Search: id:A003654
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| A003654 |
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Fundamental unit of Q(sqrt(n)) has norm -1; also square-free n such that Pell equation x^2 - n y^2 = -1 is soluble.
(Formerly M1366)
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+0
6
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| 2, 5, 10, 13, 17, 26, 29, 37, 41, 53, 58, 61, 65, 73, 74, 82, 85, 89, 97, 101, 106, 109, 113, 122, 130, 137, 145, 149, 157, 170, 173, 181, 185, 193, 197, 202, 218, 226, 229, 233, 241, 257, 265, 269, 274, 277, 281, 290, 293, 298, 313, 314, 317, 337, 346, 349, 353, 362
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The square-free elements of A003814. [From Max Alekseyev (maxale(AT)gmail.com), Jun 01 2009]
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.
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LINKS
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S. R. Finch, Class number theory
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CROSSREFS
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Cf. A031396, A031397, A003814.
Sequence in context: A145017 A003814 A031396 this_sequence A047617 A135467 A018571
Adjacent sequences: A003651 A003652 A003653 this_sequence A003655 A003656 A003657
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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