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A158333 Position of number of digits increment in the sequence of powers of 3. 2
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 133, 135 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(n)=1+Floor(n/Log_10(3)) = 1+A054965(n).
EXAMPLE
For n=1 a(1)=3 since the sequence of powers of 3 is 1, 3, 9, 27, 81, 243, 729 and numbers of digits increase at position 1,3,5,...
MAPLE
A158333 := proc(n)
1+floor(n/log10(3)) ;
end proc:
seq(A158333(n), n=0..20) ; # R. J. Mathar, Sep 01 2014
MATHEMATICA
a[x_] := 1 + Floor[x/Log[10, 3]]; Table[a[i], {i, 0, 20}]
CROSSREFS
Sequence in context: A033037 A246413 A246411 * A293167 A357377 A062505
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Indices in offset, example, and formula adjusted by R. J. Mathar, May 21 2009
More terms from Robert G. Wilson v, May 29 2009
STATUS
approved

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Last modified March 28 11:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)