OFFSET
1,2
COMMENTS
Even single (or isolated) numbers/2. Unit together with (average of twin prime pairs (A014574), divided by 2).
FORMULA
a(n)=A167777(n)/2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Nov 27 2009
EXTENSIONS
Entries checked by R. J. Mathar, Apr 14 2010
STATUS
approved