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URL: https://oeis.org/A034170

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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
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.
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
KEYWORD
nonn,fini,full
AUTHOR
Jonathan Borwein (jborwein(AT)cecm.sfu.ca), Stephen Choi (choi(AT)cecm.sfu.ca)
STATUS
approved