

A218038


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


11



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
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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, A029702A029705, A218039A218042.
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



