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A079700
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a(n) is the 2-adic valuation of the n-th even nontotient.
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1
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1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 3, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 4, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 3, 1, 1, 2, 3, 1, 4
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OFFSET
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1,7
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LINKS
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FORMULA
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EXAMPLE
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MATHEMATICA
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IntegerExponent[Select[Range[2, 500, 2], invphi[#] == {}&], 2] (* Jean-François Alcover, Jul 01 2017, using Maxim Rytin's invphi function *)
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PROG
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(PARI) lista(nn)=forstep(n=2, nn, 2, if (!istotient(n), print1(valuation(n, 2), ", ")); ); \\ Michel Marcus, Jul 01 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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