A094682 - OEIS

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A094682

Discriminants of integer positive ternary quadratic forms that are spinor regular but not regular.

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