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Search: id:A141468
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| 0, 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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0 and 1 together with the composite numbers (A002808). [From Omar E. Pol (info(AT)polprimos.com), Jul 04 2009]
A141468 U A000040 = A001477 = A158611 U A002808. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 28 2009, Sep 27 2009]
Contribution from Omar E. Pol (info(AT)polprimos.com), Aug 13 2009: (Start)
The sequence of nonprime numbers (A018252) starts: 1,4,6,8,9,10,12,14,15,... (Offset=1). Note that zero is not a member of A018252 because the words "prime" and "nonprime" normally refer to the natural numbers or positive integers (1,2,3,4,5,6,...).
We know that the n-th nonprime is A018252(n). Then, about this sequence (A141468 with offset=1), we can write: A141468(n+1) = A018252(n), (See example and formula). (End)
Largest nonprime<nth nonprime (cf.A018252). [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Oct 29 2009]
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LINKS
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N. J. A. Sloane, Table of n, a(n) for n = 1..17739
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FORMULA
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a(1)=0. a(n)=A018252(n-1), n>1. [From Omar E. Pol (info(AT)polprimos.com), Aug 13 2009]
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EXAMPLE
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Contribution from Omar E. Pol (info(AT)polprimos.com), Aug 13 2009: (Start)
==============================
.................... The n-th
n ...... a(n) ...... nonprime
==============================
1 ....... 0 ........... 1
2 ....... 1 ........... 4
3 ....... 4 ........... 6
4 ....... 6 ........... 8
5 ....... 8 ........... 9
6 ....... 9 .......... 10
(End)
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CROSSREFS
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Cf. A018252.
Cf. A002808. [From Omar E. Pol (info(AT)polprimos.com), Jul 04 2009]
Sequence in context: A088224 A002808 A018252 this_sequence A077091 A051035 A046349
Adjacent sequences: A141465 A141466 A141467 this_sequence A141469 A141470 A141471
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KEYWORD
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nonn,new
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 11 2008
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EXTENSIONS
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Added 68 by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 14 2008
Better definition from Omar E. Pol (info(AT)polprimos.com), Jun 30 2009
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