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A166447 a(n) = n*round(sqrt(n)). 1
0, 1, 2, 6, 8, 10, 12, 21, 24, 27, 30, 33, 36, 52, 56, 60, 64, 68, 72, 76, 80, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 186, 192, 198, 204, 210, 216, 222, 228, 234, 240, 246, 252, 301, 308, 315, 322, 329, 336, 343, 350, 357, 364, 371, 378, 385, 392, 456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = n*A000194(n). - R. J. Mathar, Nov 18 2009

MATHEMATICA

Clear[lst, n, f] f[n_]:=Round[Sqrt[n]]; lst={}; Do[AppendTo[lst, n*f[n]], {n, 0, 6!}]; lst

PROG

(MAGMA) [n*Round(Sqrt(n)): n in [0..60]]; // Vincenzo Librandi, May 15 2016

CROSSREFS

Sequence in context: A049637 A284753 A258663 * A075332 A141105 A047395

Adjacent sequences:  A166444 A166445 A166446 * A166448 A166449 A166450

KEYWORD

nonn,easy

AUTHOR

Vladimir Joseph Stephan Orlovsky, Oct 13 2009

STATUS

approved

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Last modified October 15 09:22 EDT 2019. Contains 328026 sequences. (Running on oeis4.)