A004961 a(n) = ceiling(n*phi^6), where phi is the golden ratio.

0, 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, 252, 270, 288, 306, 323, 341, 359, 377, 395, 413, 431, 449, 467, 485, 503, 521, 539, 557, 575, 593, 611, 629, 646, 664, 682, 700, 718, 736, 754, 772

Offset

0,2

Links

Table of n, a(n) for n=0..43.

Mathematica

Ceiling[GoldenRatio^6 Range[0, 50]] (* Harvey P. Dale, Jun 21 2017 *)

Prog

(PARI) a(n)=9*n+sqrtint(80*n^2)+1 \\ Charles R Greathouse IV, Oct 15 2012

Crossrefs

Sequence in context: A329611 A166403 A004941 * A008600 A131766 A154575

Adjacent sequences: A004958 A004959 A004960 * A004962 A004963 A004964

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved