A004961 - OEIS

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A004961

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

0

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

(list; graph; refs; listen; history; text; internal format)

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 A373599 A131766

Adjacent sequences: A004958 A004959 A004960 * A004962 A004963 A004964

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved