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A163300 Zero together with the even nonprimes. 20
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; text; internal format)
OFFSET

1,2

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). - Omar E. Pol, Aug 04 2009

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = 2*A087156(n).

a(n) = 2*{n-1+[(n+1) mod n]}, with n>=1. - Paolo P. Lava, Nov 06 2009

MATHEMATICA

Drop[Range[0, 132, 2], {2}] (* Harvey P. Dale, May 05 2012 *)

CROSSREFS

Cf. A014076, A141468, A018252.

Sequence in context: A063127 A272651 A103517 * A193175 A093161 A111305

Adjacent sequences:  A163297 A163298 A163299 * A163301 A163302 A163303

KEYWORD

nonn,easy

AUTHOR

Juri-Stepan Gerasimov, Jul 26 2009

EXTENSIONS

Better definition from Omar E. Pol, Aug 04 2009

STATUS

approved

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Last modified March 23 05:36 EDT 2019. Contains 321422 sequences. (Running on oeis4.)