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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..10000

Sean A. Irvine, Table of n, a(n) for n = 1..981731 [a large file]

OEIS server, Scatterplot of n, a(n) with n=1..10^6.

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: A128313 A283486 A216607 * A025665 A025841 A138468

Adjacent sequences:  A025669 A025670 A025671 * A025673 A025674 A025675

KEYWORD

nonn

AUTHOR

David W. Wilson

EXTENSIONS

Incorrect formula deleted by Sean A. Irvine, Feb 20 2012

STATUS

approved

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Last modified August 23 03:42 EDT 2017. Contains 290958 sequences.