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A048276
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a(n) = number of squarefree numbers among C(n,k), k=0..n.
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3
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2, 3, 4, 3, 6, 6, 8, 3, 2, 6, 12, 4, 10, 12, 14, 2, 6, 2, 8, 8, 10, 12, 24, 4, 4, 8, 2, 4, 12, 6, 12, 2, 4, 8, 8, 2, 8, 14, 12, 4, 12, 14, 26, 16, 8, 20, 42, 2, 2, 2, 4, 6, 18, 4, 6, 2, 6, 10, 22, 8, 26, 40, 8, 2, 4, 6, 8, 8, 16, 12, 18, 2, 8, 18, 4, 6, 14, 18, 34, 2, 2, 4, 6, 4, 10, 12, 16, 4
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| If n=20, then C[ 20,k ] is squarefree for k = 0,2,4,8,12,16,18,20 i.e. for 8 cases of k, so a[ 20 ]=8.
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CROSSREFS
| A005117, A046098, A048277.
Sequence in context: A126801 A076945 A074792 * A127463 A076618 A116550
Adjacent sequences: A048273 A048274 A048275 * A048277 A048278 A048279
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu)
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