This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A263465 #20 May 29 2016 01:46:53 %S A263465 1,2,3,7,11 %N A263465 Values of D for which the imaginary quadratic field Q[ sqrt(-D) ] is norm-Euclidean. %C A263465 Hardy & Wright's Theorem 246: "There are just five complex Euclidean quadratic fields, viz., ... ." %D A263465 P. M. Cohn, On the structure of the GL2 of a ring, Publ. Math. Inst. Hautes Etudes Sci., 30 (1966), 5-53. %D A263465 G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers. 5th ed., Oxford Univ. Press, 1979, p. 213. %H A263465 Bogdan Nica, <a href="http://www.jstor.org/stable/10.4169/amer.math.monthly.118.05.455">The Unreasonable Slightness of E2 over Imaginary Quadratic Rings</a>, Amer. Math. Monthly, 118 (2011), 455-462. %H A263465 Arseniy Sheydvasser, <a href="http://dx.doi.org/10.4169/amer.math.monthly.123.5.482">A Corrigendum to Unreasonable Slightness</a>, Amer. Math. Monthly, 123 (2016), 482-485. %F A263465 a(n) = A003173(n) = -A048981(6-n) for n = 1, 2, 3, 4, 5. %Y A263465 Cf. A003173, A003174, A048981. %K A263465 nonn,fini,full %O A263465 1,2 %A A263465 _Jonathan Sondow_, Oct 19 2015