A001987 - OEIS

A001987

Class numbers associated with terms of A001986.
(Formerly M5235 N2278)

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 33, 79, 79, 107, 107, 311, 487, 487, 665, 665, 857, 2293, 3523, 3523, 3523, 13909, 13909, 13909, 26713, 29351, 29351, 59801, 70877, 70877, 70877, 70877, 296475, 296475, 296475, 296475, 3201195

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

OFFSET

1,12

REFERENCES

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

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..42.

Michael John Jacobson, Jr., Computational Techniques in Quadratic Fields, Master's thesis, University of Manitoba, Winnipeg, Manitoba, 1995.

Michael John Jacobson Jr. and Hugh C. Williams, New quadratic polynomials with high densities of prime values, Math. Comp. 72 (2003), 499-519.

D. H. Lehmer, E. Lehmer and D. Shanks, Integer sequences having prescribed quadratic character, Math. Comp., 24 (1970), 433-451.

D. H. Lehmer, E. Lehmer and D. Shanks, Integer sequences having prescribed quadratic character, Math. Comp., 24 (1970), 433-451 [Annotated scanned copy]

CROSSREFS

Cf. A001986, A094846. See also A094842, A094851.

Sequence in context: A211837 A138863 A138866 * A094846 A044171 A044552

Adjacent sequences: A001984 A001985 A001986 * A001988 A001989 A001990

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

Revised by N. J. A. Sloane, Jun 14 2004

STATUS

approved