OFFSET
0,2
COMMENTS
This is to 3 as A058220 is to 2.
FORMULA
EXAMPLE
a(4) = 10 because 3^(3^4) - 10 = 443426488243037769948249630619149892793 is prime.
PROG
(PARI) a(n) = x = 3^(3^n); x - precprime(x); \\ Michel Marcus, Jan 28 2015
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Jonathan Vos Post, May 26 2008
EXTENSIONS
a(5)-a(8) from Cino Hilliard, Jun 02 2008
a(9)-a(10) from Donovan Johnson, Sep 13 2008
a(0) prepended and a(11) from Michael S. Branicky, Aug 23 2024
STATUS
approved