A004921 - OEIS (original) (raw)

0, 17, 35, 53, 71, 89, 107, 125, 143, 161, 179, 197, 215, 233, 251, 269, 287, 305, 322, 340, 358, 376, 394, 412, 430, 448, 466, 484, 502, 520, 538, 556, 574, 592, 610, 628, 645, 663, 681, 699, 717, 735, 753, 771

FORMULA

a(n) = floor((9 + 4*sqrt(5))*n).

a(n) = floor((A098317)^2*n). (End)

MATHEMATICA

Floor[GoldenRatio^6*Range[0, 50]] (* G. C. Greubel, Aug 22 2023 *)

PROG

(Magma) [Floor((9+4*Sqrt(5))*n): n in [0..50]]; // G. C. Greubel, Aug 22 2023

(SageMath) [floor((9+4*sqrt(5))*n) for n in range(51)] # G. C. Greubel, Aug 22 2023