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A293331 Greatest integer k such that k/2^n < sqrt(5). 4
2, 4, 8, 17, 35, 71, 143, 286, 572, 1144, 2289, 4579, 9158, 18317, 36635, 73271, 146542, 293085, 586171, 1172343, 2344687, 4689374, 9378748, 18757497, 37514995, 75029990, 150059981, 300119963, 600239927, 1200479854, 2400959708, 4801919417, 9603838834 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Clark Kimberling, Table of n, a(n) for n = 0..1000

FORMULA

a(n) = floor(r*2^n), where r = sqrt(5).

a(n) = A293332(n) - 1.

MATHEMATICA

z = 120; r = Sqrt[5];

Table[Floor[r*2^n], {n, 0, z}];   (* A293331 *)

Table[Ceiling[r*2^n], {n, 0, z}]; (* A293332 *)

Table[Round[r*2^n], {n, 0, z}];   (* A293333 *)

CROSSREFS

Cf. A001633, A293332, A293333.

Sequence in context: A026392 A266897 A018094 * A001357 A058520 A127680

Adjacent sequences:  A293328 A293329 A293330 * A293332 A293333 A293334

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Oct 10 2017

STATUS

approved

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Last modified February 17 15:19 EST 2019. Contains 320220 sequences. (Running on oeis4.)