OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..23
FORMULA
a(n) = 3^A219046(n) + 28. - Elmo R. Oliveira, Nov 12 2023
MATHEMATICA
Select[Table[3^n+28, {n, 0, 1000}], PrimeQ] (* Vincenzo Librandi, Jul 19 2012 *)
PROG
(Magma) [ a: n in [0..100] | IsPrime(a) where a is 3^n+28 ]; // Vincenzo Librandi, Jul 19 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Roger L. Bagula, Mar 01 2005
EXTENSIONS
a(1) added by Vincenzo Librandi, Jul 19 2012
STATUS
approved