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A051215 Numbers of the form 4^x-y^2 >= 0. 2

%I

%S 0,1,3,4,7,12,15,16,28,31,39,48,55,60,63,64,87,112,124,127,135,156,

%T 175,183,192,207,220,231,240,247,252,255,256,295,348,375,399,448,495,

%U 496,508,511,540,583,615,624,663,700,732,735,759,768,799,828,847,855,880

%N Numbers of the form 4^x-y^2 >= 0.

%t max = 1000; Clear[f]; f[m_] := f[m] = Select[Table[4^x - y^2, {x, 0, m}, {y, 0, Ceiling[4^(x/2)]}] // Flatten // Union, 0 <= # <= max &]; f[1]; f[m = 2]; While[f[m] != f[m - 1], m++]; Print["m = ", m]; A051215 = f[m] (* _Jean-Fran├žois Alcover_, May 14 2017 *)

%K nonn

%O 1,3

%A _David W. Wilson_

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Last modified October 16 19:23 EDT 2021. Contains 348043 sequences. (Running on oeis4.)