A002480 - OEIS

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A002480

Numbers of the form 2x^2 + 3y^2.
(Formerly M0683 N0252)

0, 2, 3, 5, 8, 11, 12, 14, 18, 20, 21, 27, 29, 30, 32, 35, 44, 45, 48, 50, 53, 56, 59, 62, 66, 72, 75, 77, 80, 83, 84, 93, 98, 99, 101, 107, 108, 110, 116, 120, 125, 126, 128, 131, 140, 146, 147, 149, 155, 158, 162

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

REFERENCES

L. Euler, (E388) Vollstaendige Anleitung zur Algebra, Zweiter Theil, reprinted in: Opera Omnia. Teubner, Leipzig, 1911, Series (1), Vol. 1, p. 425.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Peter Munn, Table of n, a(n) for n = 1..252 (based on A108563 b-file)

L. Euler, Vollstaendige Anleitung zur Algebra, Zweiter Teil.

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

CROSSREFS

For primes see A084865.

Cf. A000075 (growth), A002481, A108563.

Sequence in context: A028891 A028890 A189716 * A173672 A303024 A070223

Adjacent sequences: A002477 A002478 A002479 * A002481 A002482 A002483

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mira Bernstein

STATUS

approved