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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
OFFSET
0,4
COMMENTS
a(n) + A061392(n) = n+1.
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
Partial sums of A316829.
Sequence in context: A276952 A096336 A358062 * A337020 A351519 A046700
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 23 2003
STATUS
approved