A218038 Numbers n such that Q(sqrt(n)) has class number 6.

235, 346, 427, 506, 574, 697, 785, 786, 842, 874, 894, 895, 898, 899, 906, 985, 1086, 1191, 1211, 1339, 1342, 1345, 1406, 1527, 1546, 1639, 1735, 1758, 1765, 1851, 1866, 1882, 1937, 1954, 2118, 2230, 2233, 2263, 2298, 2495, 2505, 2510, 2554, 2666, 2678, 2726

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[2726], SquareFreeQ[#] && NumberFieldClassNumber@Sqrt[#] == 6 &]

Prog

(PARI) is(n)=issquarefree(n) && qfbclassno(if(n%4>1, 4, 1)*n)==6 \\ Charles R Greathouse IV, Jan 19 2017

Crossrefs

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

Sequence in context: A036209 A077803 A049857 * A132903 A247474 A147148

Adjacent sequences: A218035 A218036 A218037 * A218039 A218040 A218041

Keyword

nonn

Author

Arkadiusz Wesolowski, Oct 19 2012

Status

approved