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%I #9 Sep 08 2022 08:45:50
%S 11,103,10007,10000000019,100000000000000000039,
%T 100000000000000000000000000000000069
%N Primes of the form 10^n+2*n-1.
%H Vincenzo Librandi, <a href="/A173851/b173851.txt">Table of n, a(n) for n = 1..12</a>
%t Select[Table[10^n + 2 n - 1, {n, 400}], PrimeQ] (* _Vincenzo Librandi_, Jan 03 2014 *)
%o (Magma) [a: n in [1..100] | IsPrime(a) where a is 10^n+2*n-1]; // _Vincenzo Librandi_, Jan 03 2014
%Y Cf. A174175.
%K nonn
%O 1,1
%A _Vincenzo Librandi_, Feb 26 2010
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