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URL: https://oeis.org/A218042

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A218042
Numbers n such that Q(sqrt(n)) has class number 10.
11
1111, 1226, 2031, 2335, 2362, 2602, 2986, 3129, 3246, 3379, 3585, 3598, 3599, 3722, 3782, 3966, 4097, 4321, 4334, 4359, 4555, 4582, 4586, 4843, 4865, 4867, 5071, 5611, 5615, 5630, 5631, 5777, 6071, 6078, 6085, 6087, 6202, 6239, 6294, 6395, 6574, 6854, 6891
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[6891], SquareFreeQ[#] && NumberFieldClassNumber@Sqrt[#] == 10 &]
PROG
(PARI) is(n)=issquarefree(n) && qfbclassno(if(n%4>1, 4, 1)*n)==10 \\ Charles R Greathouse IV, Jan 19 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved