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A081609 Number of numbers <= n having at least one 1 in their ternary representation. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

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

LINKS

Table of n, a(n) for n=0..73.

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

CROSSREFS

Cf. A007089, A062756, A081607, A081610.

Sequence in context: A071991 A276952 A096336 * A337020 A046700 A216411

Adjacent sequences:  A081606 A081607 A081608 * A081610 A081611 A081612

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Mar 23 2003

STATUS

approved

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Last modified April 20 12:58 EDT 2021. Contains 343135 sequences. (Running on oeis4.)