A076498 Class number h(p) of real quadratic field Q(sqrt(p)) where p is n-th prime == 1 mod 4.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset

1,22

Links

Table of n, a(n) for n=1..80.

Herman te Riele and Hugh Williams, New computations concerning the Cohen-Lenstra heuristics, Experiment. Math. 12 (2003), no. 1, 99-113; alternative link.

Example

h(p) = 1 for p < 229, h(229) = h(257) = h(733) = h(761) = 3, h(401) = 5 and h(577) = 7, ...

Crossrefs

Cf. A002144, A003649, A076499.

Sequence in context: A345441 A267863 A262681 * A110268 A058965 A226306

Adjacent sequences: A076495 A076496 A076497 * A076499 A076500 A076501

Keyword

nonn

Author

N. J. A. Sloane, Nov 11 2002

Status

approved