OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
If n=169 then 999n = 999169 (prime).
MATHEMATICA
Select[Range[900], PrimeQ[999*10^IntegerLength[#]+#]&] (* Harvey P. Dale, Sep 05 2017 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Sep 12 2005
EXTENSIONS
More terms from Vincenzo Librandi, Mar 27 2010
STATUS
approved