OFFSET
1,1
COMMENTS
Corresponding n's are 7, 9, 11, 12, 13, 19, 20, 21, 23, 31, 35, 37, 45, 57, 73, 84, 89.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..33
EXAMPLE
2^7-69=59 (prime), 2^9-69=443 (prime), 2^11-69=1979(prime).
MATHEMATICA
Select[Table[2^n - 69, {n, 7, 100}], PrimeQ] (* Vincenzo Librandi, Mar 21 2013 *)
PROG
(Magma) [a: n in [7..100] | IsPrime(a) where a is 2^n - 69]; // Vincenzo Librandi, Mar 21 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Nov 17 2006
STATUS
approved