A079030 Least k such that the class number of quadratic order of discriminant D=-4k equals n.

1, 5, 11, 14, 47, 26, 71, 41, 59, 74, 167, 89, 191, 101, 131, 146, 383, 236, 311, 194, 251, 269, 647, 299, 479, 314, 419, 341, 887, 461, 719, 446, 659, 614, 1031, 626, 1487, 1199, 1019, 689, 1151, 794, 1847, 854, 971, 941, 3023, 1106, 1511, 1109, 1091, 1256, 2711

Offset

1,2

Links

Table of n, a(n) for n=1..53.

Prog

(PARI) a(n)=if(n<0, 0, k=1; while(abs(n-qfbclassno(-4*k))>0, k++); k)

Crossrefs

Cf. A000003.

Sequence in context: A336177 A314001 A196206 * A103011 A137002 A091718

Adjacent sequences: A079027 A079028 A079029 * A079031 A079032 A079033

Keyword

nonn

Author

Benoit Cloitre, Feb 01 2003

Status

approved