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 A218158 #10 Feb 16 2025 08:33:18 %S A218158 904,1596,1705,1768,1785,2584,2605,2705,3081,3196,3201,3480,3640,3976, %T A218158 4092,4161,4305,4488,4620,4669,4956,5160,5196,5249,5305,5404,5513, %U A218158 5713,5772,5784,5865,6360,6409,6565,6757,6953,6972,7449,7585,7656,7788,7833,7980,8005 %N A218158 Fundamental discriminants of real quadratic number fields with class number 8. %H A218158 Victor Y. Wang, <a href="http://arxiv.org/abs/1508.06552">On Hilbert 2-class fields and 2-towers of imaginary quadratic number fields</a>, arXiv preprint arXiv:1508.06552, 2015 %H A218158 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ClassNumber.html">Class Number</a> %H A218158 <a href="/index/Qua#quadfield">Index entries for sequences related to quadratic fields</a> %t A218158 Select[Range[8005], NumberFieldDiscriminant@Sqrt[#] == # && NumberFieldClassNumber@Sqrt[#] == 8 &] %Y A218158 Cf. A003656, A094619, A094612-A094614, A218156-A218157, A218159-A218160. %K A218158 nonn %O A218158 1,1 %A A218158 _Arkadiusz Wesolowski_, Oct 22 2012