0,2

Table of n, a(n) for n=0..4.

a(1)=3 since Q[X]/(X^2-z) ramifies only at 2 iff z= -1, 2, -2 (up to squares).

Sequence in context: A081010 A100377 A270396 * A269995 A281093 A199347

Adjacent sequences: A167166 A167167 A167168 * A167170 A167171 A167172

nonn

Gaël Collinet, Oct 29 2009

approved