A195178 a(n) = 4*n - floor(2*n*sqrt(2)).

0, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 77, 78, 79, 80

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..10000

Formula

a(n) = A008586(n) - A022842(n). - Michel Marcus, Oct 31 2017

Mathematica

With[{c=2Sqrt[2]}, Table[4n-Floor[c n], {n, 0, 90}]] (* Harvey P. Dale, Sep 17 2011 *)

Prog

(Magma) [4*n-Floor(2*n*(Sqrt(2))): n in [0..70]]; // Vincenzo Librandi, Sep 12 2011
(PARI) for(n=0, 50, print1(4*n - floor(2*n*sqrt(2)), ", ")) \\ G. C. Greubel, Oct 30 2017

Crossrefs

Cf. A008586, A022842.

Sequence in context: A020659 A047304 A020658 * A043092 A023801 A332107

Adjacent sequences: A195175 A195176 A195177 * A195179 A195180 A195181

Keyword

nonn

Author

Clark Kimberling, Sep 10 2011

Status

approved