The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A081609 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A081609

Number of numbers <= n having at least one 1 in their ternary representation.
(history; published version)

#10 by Michael De Vlieger at Sat Jun 25 10:01:48 EDT 2022

STATUS

proposed

approved

#9 by Michel Marcus at Sat Jun 25 05:33:36 EDT 2022

STATUS

editing

proposed

#8 by Michel Marcus at Sat Jun 25 05:33:34 EDT 2022

CROSSREFS

Cf. A007089, A062756, A081607, A081610, A061392.

STATUS

proposed

editing

#7 by Sean A. Irvine at Sat Jun 25 05:10:33 EDT 2022

STATUS

editing

proposed

#6 by Sean A. Irvine at Sat Jun 25 05:10:30 EDT 2022

CROSSREFS

Partial sums of A316829.

STATUS

approved

editing

#5 by Charles R Greathouse IV at Wed Sep 02 14:29:54 EDT 2015

STATUS

editing

approved

#4 by Charles R Greathouse IV at Wed Sep 02 14:29:52 EDT 2015

PROG

(PARI) has(n)=!!setsearch(Set(digits(n, 3)), 1)

first(n)=my(s); vector(n, k, s+=has(k)) \\ Charles R Greathouse IV, Sep 02 2015

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:50:31 EDT 2012

AUTHOR

_Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), _, Mar 23 2003

Discussion

Fri Mar 30

18:50

OEIS Server: https://oeis.org/edit/global/246

#2 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystemsgmail.com), Mar 23 2003

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Number of numbers <= n having at least one 1 in their ternary representation.

DATA

0, 1, 1, 2, 3, 4, 4, 5, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 14, 15, 15, 16, 17, 18, 18, 19, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 46, 47, 47, 48, 49, 50, 50, 51, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 60, 61

OFFSET

0,4

COMMENTS

a(n) + A061392(n) = n+1.

CROSSREFS

Cf. A007089, A062756, A081607, A081610.

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Mar 23 2003

STATUS

approved