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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, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,22

REFERENCES

H. Williams and H. te Riele, New computations concerning the Cohen-Lenstar heuristics, Experiment. Math. 12 (2003), no. 1, 99-113.

LINKS

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

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, A076499.

Sequence in context: A124921 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

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Last modified May 25 11:04 EDT 2019. Contains 323539 sequences. (Running on oeis4.)