A141096 Even numbers not representable as the sum of two coprime nonprime numbers.

4, 6, 8, 12, 14, 18, 20, 24, 30, 32, 38, 42, 48, 54, 60, 72, 80, 84, 90, 108, 110, 132, 138, 140, 150, 180

Offset: 1

Author

T. D. Noe, Jun 02 2008

Keywords

• nonn
• fini
• full

Comments

Numbers k such that A141095(k/2) = 0.

180 is the last term.

This sequence is a subsequence of A141098.

Crossrefs

Cf. A141095, A141098.

Programs

Mathematica

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 *)