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A093052
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Exponent of 2 in 6^n - 2^n.
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2
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0, 2, 5, 4, 8, 6, 9, 8, 13, 10, 13, 12, 16, 14, 17, 16, 22, 18, 21, 20, 24, 22, 25, 24, 29, 26, 29, 28, 32, 30, 33, 32, 39, 34, 37, 36, 40, 38, 41, 40, 45, 42, 45, 44, 48, 46, 49, 48, 54, 50, 53, 52, 56, 54, 57, 56, 61, 58, 61, 60, 64, 62, 65, 64, 72, 66, 69, 68, 72
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..68.
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FORMULA
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Recurrence: a(2n) = a(n) + [(n+1)/2] + 1, a(2n+1) = 2n+2.
a(n) = n + A007814(A024023(n)) = n + A090740(n). - Reinhard Zumkeller, Mar 27 2004
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MATHEMATICA
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Join[{0}, Table[IntegerExponent[6^n-2^n, 2], {n, 70}]] (* From Harvey P. Dale, Mar 08 2012 *)
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PROG
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(PARI) a(n)=if(n<1, 0, if(n%2==0, a(n/2)+2*floor((n+2)/4)+1, n+1)
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CROSSREFS
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a(n-1) is the exponent of 2 in A009168(n), A012394(n), A088991(n), A009083(n), A012036(n), A012092(n), A012395(n), A012460(n), A012465(n), A012466(n), A012467(n), (A049294(n)-1)/3.
Cf. A093050, A093051.
Sequence in context: A060710 A146101 A206256 * A081556 A033686 A134079
Adjacent sequences: A093049 A093050 A093051 * A093053 A093054 A093055
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KEYWORD
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nonn
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AUTHOR
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Ralf Stephan, Mar 16 2004
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STATUS
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approved
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