

A141098


Even numbers not representable as the sum of two coprime composite numbers.


5



2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 36, 38, 40, 42, 48, 50, 54, 56, 60, 66, 70, 72, 78, 80, 84, 90, 96, 108, 110, 120, 126, 132, 138, 140, 150, 180, 210
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OFFSET

1,1


COMMENTS

210 is the last term.


LINKS

Table of n, a(n) for n=1..43.


MATHEMATICA

t = Table[Length[Select[Range[2, n/2], ! PrimeQ[#] && ! PrimeQ[n  #] && GCD[#, n  #] == 1 &]], {n, 2, 2000, 2}]; Flatten[2*Position[t, 0]] (* T. D. Noe, Dec 05 2013 *)


CROSSREFS

This sequence is a superset of A141096. See A141097.
Sequence in context: A306720 A084564 A053228 * A084563 A194396 A321193
Adjacent sequences: A141095 A141096 A141097 * A141099 A141100 A141101


KEYWORD

nonn,fini,full


AUTHOR

T. D. Noe, Jun 02 2008


STATUS

approved



