A102272 - OEIS

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A102272

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

4

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

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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