OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..100
FORMULA
a(n) = 3^A000040(n).
Sum_{n>=1} 1/a(n) = A132800. - Amiram Eldar, Aug 11 2020
EXAMPLE
a(4) = 3^7 = 2187.
MATHEMATICA
3^Prime@Range@30 (* Vladimir Joseph Stephan Orlovsky, Apr 11 2011 *)
PROG
(Magma) [3^p: p in PrimesUpTo(30)]; // Vincenzo Librandi, Jun 03 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Henry Bottomley, Sep 29 2000
STATUS
approved