A003137 - OEIS

A003137

Write n in base 3 and juxtapose.
(Formerly M0040)

1, 2, 1, 0, 1, 1, 1, 2, 2, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 1, 1, 0, 2, 1, 1, 0, 1, 1, 1, 1, 1, 2, 1, 2, 0, 1, 2, 1, 1, 2, 2, 2, 0, 0, 2, 0, 1, 2, 0, 2, 2, 1, 0, 2, 1, 1, 2, 1, 2, 2, 2, 0, 2, 2, 1, 2, 2, 2, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 2, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 2, 1, 0, 2, 0, 1, 0, 2, 1, 1, 0, 2, 2, 1

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

OFFSET

1,2

COMMENTS

An irregular table in which the n-th row lists the base-3 digits of n, see A007089. - Jason Kimberley, Dec 07 2012

The base-3 Champernowne constant (A077771): it is normal in base 3. - Jason Kimberley, Dec 07 2012

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Reinhard Zumkeller, Rows n = 1..1000 of triangle, flattened

Eric Weisstein's World of Mathematics, Ternary.

Wikipedia, Ternary numeral system

EXAMPLE

1,0,

1,1,

1,2,

2,0,

2,1,

2,2,

1,0,0,

1,0,1,.... R. J. Mathar, Aug 16 2021

MATHEMATICA

Flatten@ IntegerDigits[ Range@ 40, 3] (* or *)

almostNatural[n_, b_] := Block[{m = 0, d = n, i = 1, l, p}, While[m <= d, l = m; m = (b - 1) i*b^(i - 1) + l; i++]; i--; p = Mod[d - l, i]; q = Floor[(d - l)/i] + b^(i - 1); If[p != 0, IntegerDigits[q, b][[p]], Mod[q - 1, b]]]; Array[ a[#, 3] &, 105] (* Robert G. Wilson v, Jul 01 2014 *)

PROG

(Magma) &cat[Reverse(IntegerToSequence(n, 3)):n in[1..31]]; // Jason Kimberley, Dec 07 2012

(Haskell)

a003137 n k = a003137_tabf !! (n-1) !! k

a003137_row n = a003137_tabf !! (n-1)

a003137_tabf = map reverse $ tail a030341_tabf

a003137_list = concat a003137_tabf

-- Reinhard Zumkeller, Feb 21 2013

(Python)

from itertools import count, islice

from sympy.ntheory.factor_ import digits

def A003137_gen(): return (d for m in count(1) for d in digits(m, 3)[1:])

A003137_list = list(islice(A003137_gen(), 30)) # Chai Wah Wu, Jan 07 2022

CROSSREFS

Tables in which the n-th row lists the base b digits of n: A030190 and A030302 (b=2), this sequence and A054635 (b=3), A030373 (b=4), A031219 (b=5), A030548 (b=6), A030998 (b=7), A031035 and A054634 (b=8), A031076 (b=9), A007376 and A033307 (b=10). - Jason Kimberley, Dec 06 2012

Cf. A081604 (row lengths), A053735 (row sums), A030341 (rows reversed), A077771, A007089.

Sequence in context: A324827 A205217 A054635 * A353048 A006842 A299038

Adjacent sequences: A003134 A003135 A003136 * A003138 A003139 A003140

KEYWORD

nonn,base,cons,easy,tabf

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000

STATUS

approved