OFFSET
1,1
EXAMPLE
a(1) = 3^(2-1) + 3^2 - 1 = 11.
MATHEMATICA
Table[3^(Prime[n] - 1) + (3^Prime[n] - 1), {n, 1, 20}] (* Stefan Steinerberger, Feb 28 2006 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Parthasarathy Nambi, Sep 23 2004
EXTENSIONS
More terms from Stefan Steinerberger, Feb 28 2006
STATUS
approved