0,5

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

(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

Cf. A102525, A156301.

Sequence in context: A123387 A123070 A057361 * A039729 A074065 A024811

Adjacent sequences: A136406 A136407 A136408 * A136410 A136411 A136412

easy,nonn

Ctibor O. Zizka, Mar 31 2008

approved