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A106844
Exponent of 2 in the prime factorization of A093641(n).
1
0, 1, 0, 2, 0, 1, 0, 3, 1, 0, 2, 0, 1, 4, 0, 0, 2, 1, 0, 3, 1, 2, 0, 0, 5, 1, 0, 1, 3, 0, 0, 2, 1, 0, 4, 2, 0, 3, 1, 0, 0, 1, 6, 0, 2, 0, 0, 1, 2, 0, 4, 1, 0, 1, 3, 0, 2, 1, 5, 0, 0, 0, 3, 1, 0, 0, 4, 0, 2, 1, 1, 2, 0, 7, 0, 1, 3, 0, 0, 1, 1, 2, 0, 0, 3, 0, 1, 5, 0, 2, 1, 0, 2, 0, 4, 1, 0, 0, 3, 2, 0, 6, 0, 1
OFFSET
1,4
COMMENTS
Write down all numbers of form 2^i*prime(j), j>0, i>=0, sort them, then extract i.
LINKS
FORMULA
a(n) = A007814(A093641(n)).
MATHEMATICA
f[n_] := Module[{e = IntegerExponent[n, 2]}, If[!CompositeQ[n / 2^e], e, Nothing]]; Array[f, 200] (* Amiram Eldar, Aug 24 2024 *)
CROSSREFS
Sequence in context: A245151 A243978 A356898 * A128618 A363904 A125989
KEYWORD
nonn
AUTHOR
Ralf Stephan, May 06 2005
EXTENSIONS
a(1)-a(2) inserted by Amiram Eldar, Aug 24 2024
STATUS
approved