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 A218156 #10 Feb 16 2025 08:33:18 %S A218156 697,785,940,985,1345,1384,1708,1765,1937,2024,2233,2296,2505,2941, %T A218156 2993,3021,3144,3281,3305,3368,3496,3576,3580,3592,3596,3624,3973, %U A218156 4065,4344,4764,4765,4844,5073,5353,5356,5368,5369,5529,5621,5624,5685,5901,6108,6153 %N A218156 Fundamental discriminants of real quadratic number fields with class number 6. %H A218156 Andy Huchala, <a href="/A218156/b218156.txt">Table of n, a(n) for n = 1..20000</a> %H A218156 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ClassNumber.html">Class Number</a> %H A218156 <a href="/index/Qua#quadfield">Index entries for sequences related to quadratic fields</a> %t A218156 Select[Range[6153], NumberFieldDiscriminant@Sqrt[#] == # && NumberFieldClassNumber@Sqrt[#] == 6 &] %Y A218156 Cf. A003656, A094619, A094612-A094614, A218157-A218160. %K A218156 nonn %O A218156 1,1 %A A218156 _Arkadiusz Wesolowski_, Oct 22 2012