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A022449
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c(p(n)) where p(k) is k-th prime including p(1)=1 and c(k) is k-th composite number.
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5
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4, 6, 8, 10, 14, 20, 22, 27, 30, 35, 44, 46, 54, 58, 62, 66, 75, 82, 85, 92, 96, 99, 108, 114, 120, 129, 134, 136, 142, 144, 148, 166, 171, 178, 182, 194, 196, 204, 210, 215, 221, 230, 232, 245, 247, 252, 254, 268, 285, 289, 291, 296, 302, 304, 318
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Composites (A002808) with noncomposite (A008578) subscripts. a(n) = composite(noncomposite(n)) = A002808(A008578(n)). a(n) = a(5) = 14 because a(5) = c(q(5)) = c(7) = 14, c = composite, q = noncomposite. a(n) U A050435(n) = A002808(n), a(n+1) U A175251(n) = A002808(n) for n >= 1. a(1) = 4, a(n) = A065858(n-1) = composites (A002808) with prime (A000040) subscripts for n >=2. [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Mar 13 2010]
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REFERENCES
| C. Kimberling, Fractal sequences and interspersions, Ars Combinatoria, vol. 45 p 157 1997.
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LINKS
| C. Kimberling, Interspersions
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CROSSREFS
| A065858 with a leading 4.
Sequence in context: A067315 A069148 A103800 * A088686 A161344 A127792
Adjacent sequences: A022446 A022447 A022448 * A022450 A022451 A022452
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KEYWORD
| nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
| Definition corrected by Christopher M. Tomaszewski (cmt1288(AT)comcast.net), Mar 30 2005
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