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 A351667 #12 Feb 16 2025 08:34:03 %S A351667 887,2287,2311,2383,2939,3583,3659,3823,4451,4519,5051,5743,6947,7207, %T A351667 7643,7687,8863,8963,9323,12323,13763,13883,14387,15139,15227,15443, %U A351667 15467,15859,16427,17491,20483,20507,22051,23059,23251,24859,25523,28403,29587,29723 %N A351667 Discriminants of imaginary quadratic fields with class number 29 (negated). %C A351667 Sequence contains 83 terms; largest is 166147. %C A351667 The class group of Q[sqrt(-d)] is isomorphic to C_29 for all d in this sequence. %H A351667 Andy Huchala, <a href="/A351667/b351667.txt">Table of n, a(n) for n = 1..83</a> %H A351667 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ClassNumber.html">Class Number</a> %o A351667 (Sage) %o A351667 ls = [(QuadraticField(-n, 'a').discriminant(), QuadraticField(-n, 'a').class_number()) for n in (0..10000) if is_fundamental_discriminant(-n) and not is_square(n)]; %o A351667 [-a[0] for a in ls if a[1] == 29] %Y A351667 Cf. A006203, A013658, A014602, A014603, A046002-A046020, A046125, A056987, A351664-A351666. %K A351667 nonn,fini,full %O A351667 1,1 %A A351667 _Andy Huchala_, Mar 24 2022