OFFSET
1,1
COMMENTS
The only composite terms are 12,14,15,16,18,20,21,22,25,27,33,35,49,55,77,121.
After a(42) = 11^2 = 121 all terms are primes: n > 42, a(n) = A000040(n-12).
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol and Zak Seidov, Jul 13 2009
STATUS
approved