A003650 Class number of real quadratic field with discriminant 4n+1. (Formerly M0055)

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 3, 1, 1, 1, 1, 1, 3, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 1, 3, 1, 1, 1, 2, 1, 1, 2, 2, 1, 2, 1, 2, 1, 1, 1, 5, 1, 1, 1, 1, 2, 1, 1, 4, 1, 1, 1, 1, 2, 3, 3, 2, 2, 1, 2, 1, 1, 4, 1, 1, 1

Offset

1,12

References

D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..105.

Crossrefs

Cf. A003651.

Sequence in context: A256067 A256554 A321649 * A059233 A357327 A327924

Adjacent sequences: A003647 A003648 A003649 * A003651 A003652 A003653

Keyword

nonn

Author

N. J. A. Sloane, Mira Bernstein

Status

approved