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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
2, 3, 3, 4, 5, 6, 8, 9, 6, 10, 7, 6, 9, 8, 10
OFFSET
1,1
LINKS
CROSSREFS
Sequence in context: A026838 A182229 A017864 * A029035 A153178 A118302
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Apr 14 2011
STATUS
approved