A218040 Numbers n such that Q(sqrt(n)) has class number 8.

226, 399, 442, 646, 799, 870, 910, 994, 1023, 1122, 1155, 1239, 1290, 1299, 1351, 1443, 1446, 1590, 1705, 1743, 1785, 1914, 1947, 1995, 2010, 2019, 2035, 2134, 2210, 2211, 2310, 2379, 2402, 2410, 2415, 2434, 2451, 2482, 2490, 2605, 2705, 2706, 2730, 2739, 2751

Offset

1,1

Links

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Class Number

Mathematica

Select[Range[2751], SquareFreeQ[#] && NumberFieldClassNumber@Sqrt[#] == 8 &]

Prog

(PARI) is(n)=issquarefree(n) && qfbclassno(if(n%4>1, 4, 1)*n)==8 \\ Charles R Greathouse IV, Jan 19 2017

Crossrefs

Cf. A003172, A029702-A029705, A218038-A218039, A218041-A218042.

Sequence in context: A126897 A296810 A067265 * A158229 A031708 A156814

Adjacent sequences: A218037 A218038 A218039 * A218041 A218042 A218043

Keyword

nonn

Author

Arkadiusz Wesolowski, Oct 19 2012

Status

approved