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A368057
Number of degree 4 number fields unramified outside the first n prime numbers.
2
7, 62, 379, 2165, 12315, 67887
OFFSET
1,1
LINKS
J. W. Jones and D. P. Roberts, A database of number fields, LMS J. Comput. Math. 17 (2014), no. 1, 595-618.
EXAMPLE
For n = 1, the a(1) = 7 degree 4 number fields unramified away from {2} can be given by Q(a) where a is a root of x^4 + 1, x^4 - 2x^2 + 2, x^4 - 2x^2 - 1, x^4 - 2, x^4 + 2, x^4 - 4x^2 + 2, or x^4 + 4x^2 + 2.
CROSSREFS
Cf. A126646 (degree 2), A367669 (degree 3).
Sequence in context: A254121 A047685 A171078 * A180776 A353099 A024089
KEYWORD
nonn,more
AUTHOR
Robin Visser, Dec 09 2023
STATUS
approved