OFFSET
2,1
COMMENTS
Apparently the only absent positive even integer is 4.
LINKS
Zak Seidov, Table of n, a(n) for n = 2..1001
MATHEMATICA
s={}; p=3; q=5; Do[m=2; While[MemberQ[s, m]||!PrimeQ[m+p]||!PrimeQ[m+q], m=m+2]; AppendTo[s, m]; p=q; q=NextPrime[q], {100}]; s
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Nov 10 2016
STATUS
approved