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

Author

N. J. A. Sloane, Feb 19 2005

Keywords

• nonn
• more

Links

• 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.