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A023346 Primes that remain prime through 5 iterations of function f(x) = 7x + 6. 1

%I #19 Sep 08 2022 08:44:47

%S 4259,174079,253369,275699,448859,527159,539639,649969,1101509,

%T 1218559,1230629,1319729,1426889,1780939,1929899,1947109,1960919,

%U 2082469,2087419,2262409,2479619,2499169,2797999,2808359,2809439,2813339,3089059,3363749

%N Primes that remain prime through 5 iterations of function f(x) = 7x + 6.

%C Primes p such that 7*p+6, 49*p+48, 343*p+342, 2401*p+2400 and 16807*p+16806 are also primes. - _Vincenzo Librandi_, Aug 05 2010

%H John Cerkan, <a href="/A023346/b023346.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) == 9 (mod 10). - _John Cerkan_, Oct 24 2016

%o (Magma) [n: n in [1..10000000] | IsPrime(n) and IsPrime(7*n+6) and IsPrime(49*n+48) and IsPrime(343*n+342) and IsPrime(2401*n+2400) and IsPrime(16807*n+16806)] // _Vincenzo Librandi_, Aug 05 2010

%Y Subsequence of A023225, A023259, A023290, A023318, and A024900.

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)