OFFSET
1,1
COMMENTS
Even numbers greater than 2 that do not appear in A001747.
FORMULA
a(n) = 2*A002808(n). - R. J. Mathar, Feb 23 2017
a(n) = A139270(n+1). - R. J. Mathar, Feb 25 2017
PROG
(PARI) is(n)=n%2==0 && n>6 && !isprime(n/2) \\ Charles R Greathouse IV, Feb 21 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alessandro Polcini, Feb 20 2017
STATUS
approved