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A324468
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a(n) = r(n) + r(n+1) + r(n+2), where r(n) is the ruler sequence A007814.
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1
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1, 3, 2, 3, 1, 4, 3, 4, 1, 3, 2, 3, 1, 5, 4, 5, 1, 3, 2, 3, 1, 4, 3, 4, 1, 3, 2, 3, 1, 6, 5, 6, 1, 3, 2, 3, 1, 4, 3, 4, 1, 3, 2, 3, 1, 5, 4, 5, 1, 3, 2, 3, 1, 4, 3, 4, 1, 3, 2, 3, 1, 7, 6, 7, 1, 3, 2, 3, 1, 4, 3, 4, 1, 3, 2, 3, 1, 5, 4, 5, 1, 3, 2, 3, 1
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Table[Sum[IntegerExponent[n + k, 2], {k, 0, 2}], {n, 100}] (* Vincenzo Librandi, Mar 10 2019 *)
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PROG
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(Magma) [&+[Valuation(n+k, 2): k in [0..2]]: n in [1..70]]; // Vincenzo Librandi, Mar 10 2019
(PARI) a(n) = sum(k=0, 2, valuation(n+k, 2)); \\ Michel Marcus, Mar 10 2019
(Python)
def A324468(n): return (~n & n-1).bit_length()+(~(n+1) & n).bit_length()+(~(n+2) & n+1).bit_length() # Chai Wah Wu, Jul 01 2022
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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