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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

180 is the last term. This sequence is a subset of A141098. See A141095.

LINKS

Table of n, a(n) for n=1..26.

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: A175088 A275671 A055670 * A089257 A113451 A270191

Adjacent sequences:  A141093 A141094 A141095 * A141097 A141098 A141099

KEYWORD

nonn,fini,full

AUTHOR

T. D. Noe, Jun 02 2008

STATUS

approved

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Last modified October 19 04:40 EDT 2019. Contains 328211 sequences. (Running on oeis4.)