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 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 (list; graph; refs; listen; history; text; internal format)
 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: A084564 A053228 A368861 * 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 August 11 10:58 EDT 2024. Contains 375068 sequences. (Running on oeis4.)