A177504 Primes of the form 5*10^n-9.

41, 491, 49991, 49999991, 4999999999999999999999991

Offset: 1

Author

Vincenzo Librandi, Dec 11 2010

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..9

Crossrefs

Cf. A086949, A103001.

Programs

Magma

[a: n in [0..250] | IsPrime(a) where a is 5*10^n-9];

Mathematica

Select[Table[5 10^n - 9, {n, 250}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)