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A094682 Discriminants of integer positive ternary quadratic forms that are spinor regular but not regular. 0
64, 108, 108, 128, 256, 256, 324, 343, 432, 432, 432, 1024, 1024, 1024, 1372, 1728, 2048, 3888, 4096, 4096, 4096, 5488, 6912, 6912, 16384, 16384, 27648, 62208, 87808 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

List is believed to be complete.

REFERENCES

G. L. Watson: Integral Quadratic Forms (Cambridge, 1960).

LINKS

Table of n, a(n) for n=1..29.

W. K. Chan and A. G. Earnest, Discriminant bounds for spinor regular ternary quadratic lattices, J. London Math. Soc. (2) 69 (2004), no. 3, 545-561.

W. C. Jagy, I. Kaplansky and A. Schiemann, There are 913 regular ternary forms, Mathematika 44(1997) 332-341.

A. Schiemann, Ternary positive definite quadratic forms are determined by their theta series, Math. Ann. 308(1997) 507-517.

CROSSREFS

Sequence in context: A317382 A331455 A039481 * A118158 A264590 A221258

Adjacent sequences:  A094679 A094680 A094681 * A094683 A094684 A094685

KEYWORD

nonn,fini,full

AUTHOR

Will Jagy, Jun 03 2004

STATUS

approved

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Last modified July 24 13:37 EDT 2021. Contains 346273 sequences. (Running on oeis4.)