A191934 - OEIS

%I #15 Dec 08 2016 04:26:26

%S 420,660,1092,1155,1380,1428,1540,1995,2415,2660,2820,2964,3003,3135,

%T 3255,3444,3540,3876,3927,4004,4692,4836

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

%H E. Benjamin, F. Lemmermeyer, C. Snyder, <a href="http://dx.doi.org/10.1016/S0022-314X(03)00084-2">Imaginary quadratic fields with Cl_2(k) isomorphic to (2,2,2)</a>, J. Number Theory, 103 (2003), 38-70.

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_, Jun 19 2011