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A173839
Primes of the form 10^n - 2*n - 1.
2
7, 99989, 99999999977, 99999999999971, 9999999999999999961, 9999999999999999999999999999999999999999999999999999889, 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999797
OFFSET
1,1
LINKS
MATHEMATICA
Select[Table[10^n - 2*n - 1, {n, 0, 200}], PrimeQ] (* Vincenzo Librandi, Dec 01 2012 *)
PROG
(Magma) [a: n in [0..200] | IsPrime(a) where a is 10^n - 2*n - 1]; // Vincenzo Librandi, Dec 01 2012
CROSSREFS
Cf. A174177.
Sequence in context: A110719 A068162 A158816 * A122000 A291906 A090769
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Feb 26 2010
STATUS
approved