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Heegner number
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==External links== * {{MathWorld|title=Heegner Number|urlname=HeegnerNumber}} * {{OEIS el|sequencenumber=A003173|name=Heegner numbers: imaginary quadratic fields with unique factorization|formalname=Heegner numbers: imaginary quadratic fields with unique factorization (or class number 1)}} * [https://www.ams.org/bull/1985-13-01/S0273-0979-1985-15352-2/S0273-0979-1985-15352-2.pdf Gauss' Class Number Problem for Imaginary Quadratic Fields, by Dorian Goldfeld]: Detailed history of problem. * {{cite web|last=Clark|first=Alex|title=163 and Ramanujan Constant|url=http://www.numberphile.com/videos/163.html|work=Numberphile|publisher=[[Brady Haran]]|access-date=2013-04-02|archive-url=https://web.archive.org/web/20130516045906/http://www.numberphile.com/videos/163.html|archive-date=2013-05-16|url-status=dead}} [[Category:Algebraic number theory]]
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