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A378956
a(n) is the number of imaginary biquadratic fields with class number 2*n-1.
1
47, 163, 243, 277, 421, 365, 358, 937, 417, 439, 1186, 596, 1074, 1305, 677, 633, 1453, 1579, 757, 1499, 904, 939, 3066, 952, 1542
OFFSET
1,1
COMMENTS
There are finitely many imaginary biquadratic fields given a class number.
LINKS
J. M. Basilla and I. A. C. Fajardo, Imaginary bicyclic biquadratic number fields with class number 5, Kyungpook Math. J. 64(2) (2024), 303-309.
E. Brown and C. J. Parry, The imaginary bicyclic biquadratic fields with class-number 1, J. Reine Angew. Math. 266(1974), 118-120.
S. W. Jung and S. H. Kwon, Determination of all imaginary bicyclic biquadratic number fields of class number 3, Bull. Korean Math. Soc. 35(1) (1998), 83-89.
EXAMPLE
For n=1, there are a(1)=47 imaginary biquadratic fields with class number 1.
For n=2, there are a(2)=163 imaginary biquadratic fields with class number 3.
CROSSREFS
Cf. A159456.
Sequence in context: A142529 A288022 A142634 * A140641 A141994 A185938
KEYWORD
nonn,more
AUTHOR
STATUS
approved