A172338 - OEIS

A172338

a(n) = floor(n*(sqrt(5)+sqrt(3))).

0, 3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43, 47, 51, 55, 59, 63, 67, 71, 75, 79, 83, 87, 91, 95, 99, 103, 107, 111, 115, 119, 123, 126, 130, 134, 138, 142, 146, 150, 154, 158, 162, 166, 170, 174, 178, 182, 186, 190, 194, 198, 202, 206, 210, 214, 218

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OFFSET

0,2

COMMENTS

sqrt(5)+sqrt(3) = 3.96811878506867... is the largest root of x^4 - 16*x^2 + 4.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for sequences related to Beatty sequences

MATHEMATICA

With[{c = Sqrt[5] + Sqrt[3]}, Floor[c Range[0, 60]]] (* Harvey P. Dale, Apr 10 2012 *)

PROG

(Magma) [Floor(n*Sqrt(5)+Sqrt(3)): n in [0..60] ];

(PARI) a(n)=sqrtint(sqrtint(60*n^4)+8*n^2) \\ Charles R Greathouse IV, Jan 24 2022

CROSSREFS

Cf. A110117, A172323-A172332, A172334, A172336, A172337.

Sequence in context: A179874 A190349 A103543 * A189787 A004767 A131098

Adjacent sequences: A172335 A172336 A172337 * A172339 A172340 A172341

KEYWORD

nonn,less,easy

AUTHOR

Vincenzo Librandi, Feb 01 2010

STATUS

approved