

A138579


Numbers n such that 2^(2*n9)9 is prime.


0



5, 7, 9, 10, 13, 15, 21, 67, 75, 126, 130, 147, 165, 273, 286, 354, 369
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..17.


EXAMPLE

2^(2*79)9=23, 2^(2*99)9=503, 2^(2*109)9=2039, 2^(2*139)9=131063


MATHEMATICA

q=9; For[i=q, i<=q, a={}; Do[x=2^(2*ni)i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; Print["2^(2*n", i, ")", i, " ", a]; i=i+2]


PROG

(PARI) is(n)=isprime(2^(2*n9)9) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Sequence in context: A018935 A039501 A114255 * A189703 A158251 A212191
Adjacent sequences: A138576 A138577 A138578 * A138580 A138581 A138582


KEYWORD

nonn,easy


AUTHOR

Vladimir Joseph Stephan Orlovsky, May 13 2008


STATUS

approved



