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Search: id:A007821
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| A007821 |
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Primes p(n) where n runs through the nonprimes. |
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20
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| 2, 7, 13, 19, 23, 29, 37, 43, 47, 53, 61, 71, 73, 79, 89, 97, 101, 103, 107, 113, 131, 137, 139, 149, 151, 163, 167, 173, 181, 193, 197, 199, 223, 227, 229, 233, 239, 251, 257, 263, 269, 271, 281, 293, 307, 311, 313, 317, 337, 347, 349, 359, 373
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A137588(a(n)) = n; a(n) = A000040(A018252(n)). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 28 2008
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REFERENCES
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C. Kimberling, Fractal sequences and interspersions, Ars Combinatoria, vol. 45 p 157 1997.
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LINKS
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R. Zumkeller, Table of n, a(n) for n = 1..1000
N. Fernandez, An order of primeness, F(p)
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MAPLE
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A007821 := proc(n) if isprime(n) = false then ithprime(n) fi end;
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MATHEMATICA
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Prime[ Select[ Range[75], !PrimeQ[ # ] &]] (from Robert G. Wilson v Mar 15 2004)
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CROSSREFS
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Cf. A049076, A049078, A049079, A049080, A049081, A058322, A058324, A058325, A058326, A058327, A058328, A093046, A006450.
Sequence in context: A106911 A019370 A001966 this_sequence A067774 A063637 A020623
Adjacent sequences: A007818 A007819 A007820 this_sequence A007822 A007823 A007824
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KEYWORD
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nonn
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AUTHOR
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mzerger(AT)cc4.adams.edu (Monte J. Zerger), Clark Kimberling (ck6(AT)evansville.edu)
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