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A025672 Exponent of 8 (value of j) in n-th number of form 3^i*8^j. 3
0, 0, 1, 0, 1, 0, 2, 1, 0, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 4, 3, 2, 1, 0, 4, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 6, 5, 4, 3, 2, 1, 0, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 8, 7, 6, 5, 4, 3, 2, 1, 0, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
Sean A. Irvine, Table of n, a(n) for n = 1..981730 [a large file]
FORMULA
a(n) = valuation(A025615(n),8) = valuation(A025615(n),2)/3 = A007814(A025615(n))/3. - M. F. Hasler, Feb 20 2012
PROG
(PARI) A025672(n)=valuation(A025615(n), 8) \\ M. F. Hasler, Feb 20 2012
(PARI) for(n=1, 1e9, n==8^valuation(n, 8)*3^valuation(n, 3)&&print1(valuation(n, 8), ", ")) \\ M. F. Hasler, Feb 20 2012
CROSSREFS
Sequence in context: A283486 A330759 A216607 * A025665 A357022 A025841
KEYWORD
nonn
AUTHOR
EXTENSIONS
Incorrect formula deleted by Sean A. Irvine, Feb 20 2012
STATUS
approved

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Last modified March 19 01:34 EDT 2024. Contains 370952 sequences. (Running on oeis4.)