A173852 - OEIS

%I #16 Sep 08 2022 08:45:50

%S 7,991,999999487,999999999967231

%N Primes of the form 10^n - 2^n - 1.

%C The next term is too large to display here.

%H Vincenzo Librandi, <a href="/A173852/b173852.txt">Table of n, a(n) for n = 1..6</a>

%t Select[Table[10^n-2^n-1,{n,0,100}],PrimeQ] (* _Vincenzo Librandi_, Jul 26 2012 *)

%o (Magma) /* The code gives only the terms up to a(5): */ [a: n in [0..200] | IsPrime(a) where a is 10^n-2^n-1]; // _Vincenzo Librandi_, Jul 26 2012

%Y Cf. A174179.

%K nonn,hard

%O 1,1

%A _Vincenzo Librandi_, Feb 26 2010