OFFSET
1,1
COMMENTS
a(8) has 238 digits, a(9) has 873 digits and a(10) has 989 digits.
MATHEMATICA
Select[Table[FromDigits[Join[{1}, PadLeft[{}, n, 9], {7}]], {n, 0, 1000}], PrimeQ] (* Harvey P. Dale, Oct 30 2011 *)
PROG
(Magma) [a: n in [0..250] | IsPrime(a) where a is 2*10^n-3];
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 10 2010
STATUS
approved