A188937 Let G be the class group of the imaginary quadratic field Q(sqrt(-A188661(n))); the 2-Sylow subgroup of G is cyclic of order 2^a(n).

2, 3, 3, 4, 5, 6, 8, 9, 6, 10, 7, 6, 9, 8, 10

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Daniel Shanks, Gauss's ternary form reduction and the 2-Sylow subgroup, Math. Comp. 25 (1971), 837-853.

Crossrefs

Sequence in context: A026838 A182229 A017864 * A029035 A153178 A118302

Adjacent sequences: A188934 A188935 A188936 * A188938 A188939 A188940

Keyword

nonn,more

Author

N. J. A. Sloane, Apr 14 2011

Status

approved