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A123065 Numbers primitively represented by the quadratic form 2 x^2 + xy + 4 y^2. 4
2, 4, 5, 7, 10, 14, 16, 19, 20, 25, 28, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

J. H. Conway, The Sensual (Quadratic) Form, M.A.A., 1997, p. 82.

LINKS

Table of n, a(n) for n=1..12.

CROSSREFS

Cf. A123063, A123064, A123067, A123068.

Sequence in context: A223729 A190235 A023181 * A115334 A167792 A035547

Adjacent sequences:  A123062 A123063 A123064 * A123066 A123067 A123068

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 27 2006

STATUS

approved

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Last modified August 15 13:27 EDT 2020. Contains 336504 sequences. (Running on oeis4.)