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A136409 a(n) = floor(n*log_3 2). 5
0, 0, 1, 1, 2, 3, 3, 4, 5, 5, 6, 6, 7, 8, 8, 9, 10, 10, 11, 11, 12, 13, 13, 14, 15, 15, 16, 17, 17, 18, 18, 19, 20, 20, 21, 22, 22, 23, 23, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 30, 31, 32, 32, 33, 34, 34, 35, 35, 36, 37, 37, 38, 39, 39, 40, 41, 41, 42, 42, 43, 44, 44, 45, 46, 46 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Titu Andreescu and Dorin Andrica, On a class of sums involving the floor function, Mathematical Reflections 3, 2006.

H. W. Gould and Jocelyn Quaintance, Floor and Roof Function Analogs of the Bell Numbers, INTEGERS: El. J. Comb. Number Theory 7 (2007), #A58

PROG

(Haskell)

a136409 = floor . (* logBase 3 2) . fromIntegral

-- Reinhard Zumkeller, Jul 03 2015

(PARI) a(n)=logint(2^n, 3) \\ Charles R Greathouse IV, Sep 02 2015

CROSSREFS

Cf. A102525, A156301.

Sequence in context: A123387 A123070 A057361 * A039729 A074065 A024811

Adjacent sequences:  A136406 A136407 A136408 * A136410 A136411 A136412

KEYWORD

easy,nonn

AUTHOR

Ctibor O. Zizka, Mar 31 2008

STATUS

approved

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Last modified March 23 12:43 EDT 2019. Contains 321430 sequences. (Running on oeis4.)