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A173837
Primes of the form 10^n-2*n+1.
6
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
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
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Feb 26 2010
STATUS
approved