OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..9
MATHEMATICA
Select[Table[5 10^n - 9, {n, 250}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)
PROG
(Magma)[a: n in [0..250] | IsPrime(a) where a is 5*10^n-9];
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 11 2010
STATUS
approved