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A141096
Even numbers not representable as the sum of two coprime nonprime numbers.
3
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
1,1
COMMENTS
Numbers k such that A141095(k/2) = 0.
180 is the last term.
This sequence is a subsequence of A141098.
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 *)
CROSSREFS
Sequence in context: A275671 A370745 A055670 * A089257 A113451 A270191
KEYWORD
nonn,fini,full
AUTHOR
T. D. Noe, Jun 02 2008
STATUS
approved