A368057 Number of degree 4 number fields unramified outside the first n prime numbers.

7, 62, 379, 2165, 12315, 67887

Offset

1,1

Links

Table of n, a(n) for n=1..6.

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

Adjacent sequences: A368054 A368055 A368056 * A368058 A368059 A368060

Keyword

nonn,more

Author

Robin Visser, Dec 09 2023

Status

approved