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A133315
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Positive discriminants with form class number 1.
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0
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5, 8, 12, 13, 17, 20, 21, 24, 28, 29, 32, 33, 37, 41, 44, 45, 48, 52, 53, 56, 57, 61, 68, 69, 72, 73, 76, 77, 80, 84, 88, 89, 92, 93, 97, 101, 108, 109, 112, 113, 116, 117, 124, 125, 128, 129, 132, 133, 137, 141, 149, 152, 153, 157, 161, 164, 172, 173, 176, 177, 180, 181, 184, 188, 189, 193, 197, 201, 208
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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REFERENCES
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D. A. Cox, Primes of the form x^2+ny^2, Wiley, New York, 1989.
D. E. Flath, Introduction to Number Theory, Wiley-Interscience, 1989.
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LINKS
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Table of n, a(n) for n=1..69.
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PROG
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(PARI) isA133315 (n) = (n % 4 <= 1) && (! issquare(n)) && (qfbclassno(n, 1) == 1) \\ Michel Marcus, May 23 2013
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CROSSREFS
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Sequence in context: A076635 A116602 A079896 * A003658 A003656 A003246
Adjacent sequences: A133312 A133313 A133314 * A133316 A133317 A133318
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KEYWORD
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nonn,changed
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AUTHOR
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David Brink, Dec 30 2007
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STATUS
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approved
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