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A061574
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Simple quadratic fields (i.e., with a unique prime factorization).
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4
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-163, -67, -43, -19, -11, -7, -3, -2, -1, 1, 2, 3, 5, 6, 7, 11, 13, 14, 17, 19, 21, 22, 23, 29, 31, 33, 37, 38, 41, 43, 46, 47, 53, 57, 59, 61, 62, 67, 69, 71, 73, 77, 83, 86, 89, 93, 94, 97, 101, 103, 107, 109, 113, 118, 127, 129, 131, 133, 134, 137, 139, 141, 149
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OFFSET
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-9,1
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COMMENTS
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Squarefree values of n for which the quadratic field Q[ sqrt(n) ] is a unique factorization domain, but not necessarily Euclidean. All negative values are listed. - Alonso del Arte, Feb 10 2011
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REFERENCES
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G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers, 5th ed., Oxford Univ. Press, 1979, ch. 14.
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LINKS
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MATHEMATICA
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Select[Range[-200, 200], SquareFreeQ[#] && NumberFieldClassNumber[Sqrt[#]] == 1 &] (* T. D. Noe, Feb 10 2011 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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