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A063974
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Number of terms in inverse set of usigma = sum of unitary divisors = A034448.
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1
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1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 2, 0, 1, 0, 0, 1, 2, 0, 2, 0, 0, 0, 3, 0, 1, 0, 1, 0, 3, 0, 2, 1, 0, 0, 2, 0, 1, 0, 1, 0, 2, 0, 1, 0, 0, 0, 3, 0, 2, 0, 0, 0, 3, 0, 1, 0, 0, 0, 4, 0, 1, 0, 0, 1, 0, 0, 2, 0, 1, 0, 6, 0, 1, 0, 0, 0, 1, 0, 3, 0, 1, 0, 3, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 4, 0, 1, 0, 1, 0, 2, 0, 2, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,12
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FORMULA
| Size of set {x; usigma[x]=n}.
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EXAMPLE
| usigma[x]=288, invusigma[288]={138,154,165,168,213,235,248,253}, so a(288)=8, the number of all terms in the inverse set.
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CROSSREFS
| A051444, A054973, A057637, A034444, A034448.
Sequence in context: A002324 A101671 A078979 * A144628 A080101 A025895
Adjacent sequences: A063971 A063972 A063973 * A063975 A063976 A063977
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Sep 05 2001
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