%I #6 Aug 29 2018 02:53:55
%S 53,56,61,69,77,88,89,92,93
%N Positive n such that the ring of algebraic integers O_n in a quadratic number field has class number 1 but is not Euclidean with respect to the norm.
%C The usual symbol in number theory is O_d, not O_n.
%H Erich Kaltofen and Heinrich Rolletschek, <a href="https://doi.org/10.1090/S0025-5718-1989-0982367-2">Computing greatest common divisors and factorizations in quadratic number fields</a>, Mathematics of Computation 53.188 (1989): 697-720. See page 698.
%Y Cf. A014602.
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_, Aug 29 2018