OFFSET
1,2
EXAMPLE
a(2) = prime(2^4) - 2^4 = 53 - 16 = 37.
a(3) = prime(2^9) - 2^9 = 3671 - 512 = 3159.
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Juri-Stepan Gerasimov, Jul 31 2008
EXTENSIONS
a(3) corrected and a(4)-a(7) added by Charles R Greathouse IV, Mar 29 2010
STATUS
approved