OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..12
MATHEMATICA
Select[Table[10^n + 2 n - 1, {n, 400}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)
PROG
(Magma) [a: n in [1..100] | IsPrime(a) where a is 10^n+2*n-1]; // Vincenzo Librandi, Jan 03 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Feb 26 2010
STATUS
approved