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A020685 Numbers of form 5 x^2 + 6 y^2. 2

%I #11 Jun 08 2014 15:36:01

%S 0,5,6,11,20,24,26,29,44,45,51,54,59,69,74,80,86,96,99,101,104,116,

%T 125,131,134,141,149,150,155,170,176,179,180,186,195,204,216,221,230,

%U 234,236,245,251,261,269,275,276,294,296,299,314,320,326,330,339,341,344,374,384

%N Numbers of form 5 x^2 + 6 y^2.

%H Harvey P. Dale, <a href="/A020685/b020685.txt">Table of n, a(n) for n = 1..1000</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)

%t Module[{upto=400},Select[Union[Flatten[{5*First[#]^2+6*Last[#]^2, 6*First[#]^2+ 5*Last[#]^2}&/@Tuples[Range[0,Ceiling[Sqrt[ upto/5]]], 2]]],#<=upto&]] (* _Harvey P. Dale_, Sep 04 2013 *)

%K easy,nonn

%O 1,2

%A _David W. Wilson_

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Last modified April 24 11:16 EDT 2024. Contains 371936 sequences. (Running on oeis4.)