OFFSET
1,2
EXAMPLE
a(2) = 1+2 = 3 which is prime hence a(3) = 3+4 = 7 which is also a prime,a(4)= 7+6 = 13 which is also prime hence a(5) = 13 + 8 = 21, composite hence a(6) =21+ 3= 24.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Aug 18 2002
EXTENSIONS
More terms from Sam Alexander, Mar 01 2005
STATUS
approved