

A145440


Primes of the form 8^n+9.


10



17, 73, 521, 262153, 1073741833, 144115188075855881, 73786976294838206473, 273406340597876490546562778389702670669146178861651554553221325801244124899921990402939147127881737
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OFFSET

1,1


COMMENTS

8^n+9 is prime for n= 1, 2, 3, 6, 10, 19, 22,..


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..9


EXAMPLE

For n=1, 8+9=17; n=2, 8^2+9=73; n=3, 8^3+9=521


MATHEMATICA

Select[8^Range[120]+9, PrimeQ] [From 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
Adjacent sequences: A145437 A145438 A145439 * A145441 A145442 A145443


KEYWORD

nonn


AUTHOR

Vincenzo Librandi, Mar 11 2009


STATUS

approved



