A102272 2-class number of Q(sqrt(-21p)) as p runs through primes in A102271.

16, 8, 8, 8, 16, 16, 8, 32, 16, 16, 16, 8, 16, 8, 64, 8, 8, 8, 8, 128, 16, 8, 8, 32

Offset

1,1

Links

Table of n, a(n) for n=1..24.

H. Cohn and J. C. Lagarias, On the existence of fields governing the 2-invariants of the classgroup of Q(sqrt{dp}) as p varies, Math. Comp. 41 (1983), 711-730.

Crossrefs

Cf. A102269, A102270, A102271, A102273, A102274, A102275.

Sequence in context: A204325 A355873 A102270 * A304227 A305037 A083536

Adjacent sequences: A102269 A102270 A102271 * A102273 A102274 A102275

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 19 2005

Status

approved