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A145440
Primes of the form 8^k + 9.
10
17, 73, 521, 262153, 1073741833, 144115188075855881, 73786976294838206473, 273406340597876490546562778389702670669146178861651554553221325801244124899921990402939147127881737
OFFSET
1,1
COMMENTS
8^k + 9 is prime for k = 1, 2, 3, 6, 10, 19, 22, ...
LINKS
EXAMPLE
For k=1, 8^1 + 9 = 17;
for n=2, 8^2 + 9 = 73;
for n=3, 8^3 + 9 = 521.
MATHEMATICA
Select[8^Range[120]+9, PrimeQ] (* Harvey P. Dale, Jan 18 2011 *)
PROG
(Magma) [a: n in [0..200] | IsPrime(a) where a is 8^n+9];
CROSSREFS
A subsequence of A104070. Cf. A057196.
Sequence in context: A201610 A201262 A146658 * A112013 A165691 A154419
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Mar 11 2009
STATUS
approved