A002480 - OEIS

%I M0683 N0252 #25 Feb 18 2024 23:35:50

%S 0,2,3,5,8,11,12,14,18,20,21,27,29,30,32,35,44,45,48,50,53,56,59,62,

%T 66,72,75,77,80,83,84,93,98,99,101,107,108,110,116,120,125,126,128,

%U 131,140,146,147,149,155,158,162

%N Numbers of the form 2x^2 + 3y^2.

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

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

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

%H Peter Munn, <a href="/A002480/b002480.txt">Table of n, a(n) for n = 1..252</a> (based on A108563 b-file)

%H L. Euler, <a href="http://www.mathematik.uni-bielefeld.de/~sieben/euler/euler_2.djvu">Vollstaendige Anleitung zur Algebra, Zweiter Teil</a>.

%H N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)

%Y For primes see A084865.

%Y Cf. A000075 (growth), A002481, A108563.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, _Mira Bernstein_