A191934 Numbers n such that the imaginary quadratic number field Q(sqrt(-n)) has 2-class group of type (2,2,2).

420, 660, 1092, 1155, 1380, 1428, 1540, 1995, 2415, 2660, 2820, 2964, 3003, 3135, 3255, 3444, 3540, 3876, 3927, 4004, 4692, 4836

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