OFFSET
1,17
COMMENTS
As for A071538 the convention is followed that a twin prime pair is <= n if its smaller member is <= n.
EXAMPLE
a(30)=3, since (29,31) is included along with (5,7) and (17,19).
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jun 04 2002
STATUS
approved