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A163300
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Zero together with the even nonprimes.
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18
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0, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A163300 U A014076 = A141468.
The nonprime numbers (A018252) begin: 1,4,6,8,9,10,12,14,15,... So the words "prime" and "nonprime" normally refer to the natural numbers or positive integers: 1,2,3,4,5,6,... (Zero is not a member of A018252. See also the definition of A141468). [From Omar E. Pol, (info(AT)polprimos.com), Aug 04 2009]
The even nonprime numbers. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Dec 12 2009]
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FORMULA
| a(n)=2*A087156.
a(n)=2*{n-1+[(n+1) mod n]}, with n>=1 [From Paolo P. Lava (paoloplava(AT)gmail.com), Nov 06 2009]
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CROSSREFS
| Cf. A014076, A141468.
Cf. A018252. [From Omar E. Pol, (info(AT)polprimos.com), Aug 04 2009]
Sequence in context: A175074 A063127 A103517 * A193175 A093161 A111305
Adjacent sequences: A163297 A163298 A163299 * A163301 A163302 A163303
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KEYWORD
| nonn,easy
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 26 2009
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EXTENSIONS
| Better definition from Omar E. Pol (info(AT)polprimos.com), Aug 04 2009
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