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A079030 Least k such that the class number of quadratic order of discriminant D=-4k equals n. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 25 02:12 EDT 2022. Contains 354047 sequences. (Running on oeis4.)