%I #11 Sep 08 2022 08:45:36
%S 127,233,1187,1399,1823,2141,2459,2671,2777,3307,3413,3943,4049,4261,
%T 5003,5639,5851,6911,7229,7547,7759,8501,8713,8819,9137,9349,10091,
%U 10303,10939,11257,11681,12211,12953,13907,14437,14543,15073,15391,15497,16451,16981
%N Primes congruent to 21 mod 53.
%H Vincenzo Librandi, <a href="/A142551/b142551.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) ~ 52n log n. - _Charles R Greathouse IV_, Jul 04 2016
%t Select[Prime[Range[2600]], MemberQ[{21}, Mod[#,53]] &] (* _Vincenzo Librandi_, Aug 30 2012 *)
%t Select[Range[21,17000,53],PrimeQ] (* _Harvey P. Dale_, May 11 2022 *)
%o (Magma) [p: p in PrimesUpTo(20000) | p mod 53 eq 21]; // _Vincenzo Librandi_, Aug 30 2012
%o (PARI) is(n)=isprime(n) && n%53==21 \\ _Charles R Greathouse IV_, Jul 04 2016
%Y Cf. A000040.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008
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