%I #12 Sep 08 2022 08:45:35
%S 53,107,269,431,593,647,701,809,863,971,1187,1511,1619,1889,1997,2213,
%T 2267,2591,2699,2753,2861,2969,3023,3347,3617,3671,3779,3833,4049,
%U 4157,4211,4373,4481,4643,4751,4967,5021,5237,5399,5507,5669,5939,6047,6101,6263
%N Primes congruent to 26 mod 27.
%H Vincenzo Librandi, <a href="/A141965/b141965.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[26, 30000, 27], PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Jun 21 2011 *)
%o (Magma) [p: p in PrimesUpTo(7000) | p mod 27 eq 26 ]; // _Vincenzo Librandi_, Aug 16 2012
%o (PARI) is(n)=isprime(n) && n%27==26 \\ _Charles R Greathouse IV_, Jul 01 2016
%Y Cf. A000040.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008