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 A053371 #12 Apr 14 2019 11:00:09 %S A053371 1,5,3,15,197,5,11,35,37,13,24335,99,63,65,251,43,53,9,10405,2143295, %T A053371 101,4005,21,1025,306917,11,57,145925,47,143,145,21295,7743, %U A053371 1700902565,13,1451,1601,27,7501,52021,195,3141,59535,29 %N A053371 Write fundamental unit for real quadratic field of discriminant n as x + y*omega; sequence gives values of x for n == 2 mod 4. %C A053371 Entries are indexed by values of n from A039956. %D A053371 R. A. Mollin, Quadratics, CRC Press, 1996, Tables B1-B3. %H A053371 S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/">Class number theory</a> %H A053371 Steven R. Finch, <a href="/A000924/a000924.pdf">Class number theory</a> [Cached copy, with permission of the author] %t A053371 NumberFieldFundamentalUnits[ Sqrt[#] ][[1, 2, 1]] & /@ Select[Range[2, 210, 2], SquareFreeQ] (* _Jean-François Alcover_, Jul 09 2013 *) %Y A053371 Cf. A053370-A053375. %K A053371 nonn,easy,nice %O A053371 0,2 %A A053371 _N. J. A. Sloane_, Jan 06 2000