A173837 Primes of the form 10^n-2*n+1.

2, 97, 99991, 99999999999973, 999999999999999999999999999999999999999917, 999999999999999999999999999999999999999999999999999999999999999999999857, 99999999999999999999999999999999999999999999999999999999999999999999999853

Offset

1,1

Comments

The next terms a(9) has 1176 digits. - Vincenzo Librandi, Jul 26 2012

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..8

Mathematica

Select[Table[10^n-2*n+1, {n, 0, 300}], PrimeQ] (* Vincenzo Librandi, Jul 26 2012 *)

Prog

(Magma) [a: n in [0..300] | IsPrime(a) where a is 10^n-2*n+1 ]; // Vincenzo Librandi, Jul 26 2012

Crossrefs

Sequence in context: A224083 A285023 A232865 * A351447 A036901 A258355

Adjacent sequences: A173834 A173835 A173836 * A173838 A173839 A173840

Keyword

nonn

Author

Vincenzo Librandi, Feb 26 2010

Status

approved