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 A023325 Numbers n such that n remains prime through 4 iterations of function f(x) = 9x + 4. 2

%I

%S 3,107,421,773,1567,1637,3793,4111,6961,12721,14107,17851,26267,26557,

%T 31327,33503,37003,42281,57947,60091,65423,67427,68447,75721,82223,

%U 82657,87877,96377,108107,111373,113171,122117,123887,125497,125887,127301

%N Numbers n such that n remains prime through 4 iterations of function f(x) = 9x + 4.

%C n, 9*n+4, 81*n+40, 729*n+364 and 6561*n+3280 are primes. - _Vincenzo Librandi_, Aug 04 2010

%H John Cerkan, <a href="/A023325/b023325.txt">Table of n, a(n) for n = 1..10000</a>

%o (MAGMA) [n: n in [1..5000000] | IsPrime(n) and IsPrime(9*n+4) and IsPrime(81*n+40) and IsPrime(729*n+364) and IsPrime(6561*n+3280)] // _Vincenzo Librandi_, Aug 04 2010

%Y Subsequence of A023234, A023266, and A023297.

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified July 21 06:53 EDT 2019. Contains 325192 sequences. (Running on oeis4.)