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Primes congruent to 13 mod 27.
1

%I #12 Sep 08 2022 08:45:35

%S 13,67,229,283,337,499,607,661,769,823,877,1039,1093,1201,1471,1579,

%T 1741,2011,2281,2389,2551,2659,2713,2767,3037,3253,3307,3361,3469,

%U 3631,3739,3793,3847,4441,4549,4603,4657,5197,5413,5521,5683,5737,5791,5953,6007

%N Primes congruent to 13 mod 27.

%H Vincenzo Librandi, <a href="/A141956/b141956.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) ~ 18n log n. - _Charles R Greathouse IV_, Jul 03 2016

%t Select[Range[13, 30000, 27], PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Jun 21 2011 *)

%o (Magma) [p: p in PrimesUpTo(7000) | p mod 27 eq 13 ]; // _Vincenzo Librandi_, Aug 16 2012

%o (PARI) is(n)=isprime(n) && n%27==13 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040, A141957, A141958, A141959.

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_, Jul 11 2008