

A167692


The even nonisolated nonprimes.


3



0, 8, 10, 14, 16, 20, 22, 24, 26, 28, 32, 34, 36, 38, 40, 44, 46, 48, 50, 52, 54, 56, 58, 62, 64, 66, 68, 70, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 104, 106, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 140, 142, 144, 146, 148
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

Zero together with A100319, the even numbers n such that at least one of n1 and n+1 is composite.


LINKS

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


MATHEMATICA

Select[Range[0, 100], Mod[#, 2] == 0 && !PrimeQ[#] && (! PrimeQ[#  1]  !PrimeQ[# + 1]) &] (* G. C. Greubel, Jul 07 2016 *)


PROG

(PARI) isA167692(n) = (n%2==0)&&!isprime(n)&&(!isprime(n1)!isprime(n+1)) \\ Michael B. Porter, Feb 02 2010


CROSSREFS

Cf. A100319, A164276.
Sequence in context: A030490 A076639 A100319 * A171689 A163628 A060864
Adjacent sequences: A167689 A167690 A167691 * A167693 A167694 A167695


KEYWORD

nonn,easy,less


AUTHOR

JuriStepan Gerasimov, Nov 09 2009


EXTENSIONS

Edited by Charles R Greathouse IV, Mar 22 2010


STATUS

approved



