Последовательность A003173 в OEIS = Heegner numbers: imaginary quadratic fields with unique factorization (or class number 1) // Фрагмент: 1, 2, 3, 7, 11, 19, 43, 67, 163
Последовательность A003174 в OEIS = Positive integers D such that Q[sqrt(D)] is a quadratic field which is norm-Euclidean // Фрагмент: 2, 3, 5, 6, 7, 11, 13, 17, 19, 21, 29, 33, 37, 41, 57, 73
Последовательность A048981 в OEIS = Squarefree values of n for which the quadratic field Q[ sqrt(n) ] is norm-Euclidean // Фрагмент: -11, -7, -3, -2, -1, 2, 3, 5, 6, 7, 11, 13, 17, 19, 21, 29, 33, 37, 41, 57, 73
Последовательность A263465 в OEIS = Values of D for which the imaginary quadratic field Q[ sqrt(-D) ] is norm-Euclidean // Фрагмент: 1, 2, 3, 7, 11
Последовательность A060295 в OEIS = Decimal expansion of e^(Pi*sqrt(163))
Последовательность A054466 в OEIS = Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which generate a group of order two under binary matrix multiplication
