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A177135
Primes of the form 2*10^n - 3.
0
17, 197, 1997, 19997, 19999999999997, 199999999999997, 19999999999999999999999999999999999999999999999999999999999999999999999999997
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
Cf. A102947.
Sequence in context: A018250 A021184 A069361 * A130817 A055432 A154276
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 10 2010
STATUS
approved