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A034170 Disjoint discriminants (one form per genus) of type 1. 1
5, 13, 21, 33, 37, 57, 85, 93, 105, 133, 165, 177, 253, 273, 345, 357, 385, 1365 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A subsequence of A000926, A139826, and A232528. - Andrew Howroyd, Jun 09 2018

REFERENCES

L. E. Dickson, Introduction to the theory of numbers, Dover, NY, 1929.

J. M. Borwein and P. B. Borwein, Pi and the AGM, page 293.

LINKS

Table of n, a(n) for n=1..18.

FORMULA

Intersection of A004766 and A139826. - Andrew Howroyd, Jun 09 2018

PROG

(PARI) ok(n)={n<>1 && n%4==1 && issquarefree(n) && !select(t->t<>2, quadclassunit(-4*n).cyc)} \\ Andrew Howroyd, Jun 09 2018

CROSSREFS

Cf. A000926, A004766, A034169, A139826, A232528.

Sequence in context: A166090 A065766 A288418 * A272809 A273204 A273392

Adjacent sequences:  A034167 A034168 A034169 * A034171 A034172 A034173

KEYWORD

nonn,fini,full

AUTHOR

Jonathan Borwein (jborwein(AT)cecm.sfu.ca), Stephen Choi (choi(AT)cecm.sfu.ca)

STATUS

approved

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Last modified September 26 15:51 EDT 2022. Contains 357000 sequences. (Running on oeis4.)