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A141098 Even numbers not representable as the sum of two coprime composite numbers. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

210 is the last term. This sequence is a superset of A141096. See A141097.

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

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

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Last modified April 22 14:33 EDT 2021. Contains 343177 sequences. (Running on oeis4.)