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1,1
Vincenzo Librandi, Table of n, a(n) for n = 1..12
Select[Table[10^n + 2 n - 1, {n, 400}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)
(MAGMA) [a: n in [1..100] | IsPrime(a) where a is 10^n+2*n-1]; // Vincenzo Librandi, Jan 03 2014
Cf. A174175.
Sequence in context: A287833 A155594 A077250 * A295840 A158470 A163933
Adjacent sequences: A173848 A173849 A173850 * A173852 A173853 A173854
nonn
Vincenzo Librandi, Feb 26 2010
approved