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A191934 Numbers n such that the imaginary quadratic number field Q(sqrt(-n)) has 2-class group of type (2,2,2). 0
420, 660, 1092, 1155, 1380, 1428, 1540, 1995, 2415, 2660, 2820, 2964, 3003, 3135, 3255, 3444, 3540, 3876, 3927, 4004, 4692, 4836 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..22.

E. Benjamin, F. Lemmermeyer, C. Snyder, Imaginary quadratic fields with Cl_2(k) isomorphic to (2,2,2), J. Number Theory, 103 (2003), 38-70.

CROSSREFS

Sequence in context: A070237 A305416 A156687 * A147775 A169825 A135196

Adjacent sequences:  A191931 A191932 A191933 * A191935 A191936 A191937

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 19 2011

STATUS

approved

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Last modified June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)