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%I #20 Sep 08 2022 08:45:35
%S 37,79,163,331,373,457,499,541,709,751,877,919,1087,1129,1171,1213,
%T 1297,1381,1423,1549,1759,1801,2011,2053,2137,2179,2221,2347,2389,
%U 2473,2557,2683,2767,2851,3019,3061,3187,3229,3271,3313,3607,3691,3733,3943,4027
%N Primes congruent to 16 mod 21.
%H Vincenzo Librandi, <a href="/A141895/b141895.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) ~ 12n log n. - _Charles R Greathouse IV_, Jul 03 2016
%t Select[Range[16,5000,21],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 04 2011 *)
%o (Magma) [ p: p in PrimesUpTo(5000) | p mod 21 eq 16 ]; // _Vincenzo Librandi_, Apr 05 2011
%o (PARI) is(n)=isprime(n) && n%21==16 \\ _Charles R Greathouse IV_, Jul 03 2016
%Y Cf. A000040, A124826.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008
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