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

3

`%I #15 Sep 30 2024 04:49:56
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`%S 4,6,8,12,14,18,20,24,30,32,38,42,48,54,60,72,80,84,90,108,110,132,
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`%T 138,140,150,180
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`%N Even numbers not representable as the sum of two coprime nonprime numbers.
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`%C Numbers k such that A141095(k/2) = 0.
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`%C 180 is the last term.
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`%C This sequence is a subsequence of A141098.
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`%t t = Table[Length[Select[Range[n/2], ! PrimeQ[#] && ! PrimeQ[n - #] && GCD[#, n - #] == 1 &]], {n, 2, 2000, 2}]; Flatten[2*Position[t, 0]] (* _T. D. Noe_, Dec 05 2013 *)
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`%Y Cf. A141095, A141098.
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`%K nonn,fini,full,changed
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`%O 1,1
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`%A _T. D. Noe_, Jun 02 2008
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