The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A351676 Discriminants of imaginary quadratic fields with class number 38 (negated). 1
 1199, 1535, 1671, 2031, 3047, 3415, 4916, 5127, 5528, 6423, 6548, 6559, 6927, 7016, 7091, 7135, 7444, 8276, 8315, 8651, 8939, 8983, 9179, 9487, 9524, 9659, 9727, 9908, 10216, 10715, 10779, 10984, 11432, 11463, 11507, 11915, 12779, 12904, 13667, 14099, 14164 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequence contains 237 terms; largest is 289963. The class group of Q[sqrt(-d)] is isomorphic to C_38 for all d in this sequence. LINKS Andy Huchala, Table of n, a(n) for n = 1..237 Mark Watkins, Class numbers of imaginary quadratic fields, Mathematics of Computation, 73, pp. 907-938. Eric Weisstein's World of Mathematics, Class Number PROG (Sage) 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)]; [-a[0] for a in ls if a[1] == 38] CROSSREFS Cf. A006203, A013658, A014602, A014603, A046002-A046020, A046125, A056987, A351664-A351680. Sequence in context: A251993 A250379 A190833 * A137261 A252531 A043408 Adjacent sequences: A351673 A351674 A351675 * A351677 A351678 A351679 KEYWORD nonn,fini,full AUTHOR Andy Huchala, Mar 27 2022 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 27 07:53 EDT 2023. Contains 365674 sequences. (Running on oeis4.)