OFFSET
1,1
COMMENTS
Does not include every composite number; in particular, 12 is not present. If a(n) = 12, gcd(n,12) = 1, but then one of n+4 and n+8 is divisible by 3.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Franklin T. Adams-Watters, Sep 22 2006
STATUS
approved