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A025672 Exponent of 8 (value of j) in n-th number of form 3^i*8^j. 3

%I

%S 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,

%T 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,

%U 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

%N Exponent of 8 (value of j) in n-th number of form 3^i*8^j.

%H Sean A. Irvine, <a href="/A025672/b025672.txt">Table of n, a(n) for n = 1..10000</a>

%H Sean A. Irvine, <a href="/A025672/a025672.txt">Table of n, a(n) for n = 1..981730</a> [a large file]

%H OEIS server, <a href="/A025672/a025672.png">Scatterplot of n, a(n) with n=1..10^6</a>.

%F a(n) = valuation(A025615(n),8) = valuation(A025615(n),2)/3 = A007814(A025615(n))/3. - M. F. Hasler, Feb 20 2012

%o (PARI) A025672(n)=valuation(A025615(n),8) \\ - M. F. Hasler, Feb 20 2012

%o (PARI) for(n=1,1e9,n==8^valuation(n,8)*3^valuation(n,3)&print1(valuation(n,8)",")) \\ - M. F. Hasler, Feb 20 2012

%K nonn

%O 1,7

%A _David W. Wilson_

%E Incorrect formula deleted by _Sean A. Irvine_, Feb 20 2012

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Last modified June 1 20:49 EDT 2020. Contains 334765 sequences. (Running on oeis4.)