A189678 n+[nr/s]+[nt/s]; r=1, s=arctan(1/2), t=arctan(2).

5, 10, 16, 21, 26, 32, 38, 44, 49, 54, 60, 65, 72, 77, 82, 88, 93, 98, 104, 110, 116, 121, 126, 132, 137, 144, 149, 154, 160, 165, 171, 177, 182, 188, 193, 198, 204, 209, 216, 221, 226, 232, 237, 243, 249, 254, 260, 265, 271, 276, 281, 288, 293, 298, 304, 309, 315, 321, 326, 332, 337, 343, 348, 354, 360, 365, 370, 376, 381, 387, 393, 398, 404, 409, 415, 420, 426, 432, 437, 443, 448, 453

Offset

1,1

Comments

See A189677.

Links

Table of n, a(n) for n=1..82.

Mathematica

(See A189677.)
Table[n+Floor[n/ArcTan[1/2]]+Floor[(n*ArcTan[2])/ArcTan[1/2]], {n, 90}] (* Harvey P. Dale, Mar 08 2020 *)

Crossrefs

Cf. A189677, A189679.

Sequence in context: A313877 A313878 A313879 * A313880 A313881 A313882

Adjacent sequences: A189675 A189676 A189677 * A189679 A189680 A189681

Keyword

nonn

Author

Clark Kimberling, Apr 25 2011

Status

approved