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%I #12 Sep 08 2022 08:45:35
%S 67,113,251,389,619,757,941,1033,1171,1217,1447,1493,1723,1861,1907,
%T 1999,2137,2459,2551,2689,3011,3517,3701,3793,3931,4253,4391,4483,
%U 4621,4759,4943,5081,5449,6047,6277,6323,6553,6599,6691,6737,6829,6967,7013,7151
%N Primes congruent to 21 mod 23.
%H Vincenzo Librandi, <a href="/A141925/b141925.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) ~ 22n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t Select[Range[21,20000,23],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, May 18 2011 *)
%o (Magma) [p: p in PrimesUpTo(9000) | p mod 23 eq 21 ]; // _Vincenzo Librandi_, Aug 16 2012
%o (PARI) is(n)=isprime(n) && n%23==21 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y Cf. A000040, A141926.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008
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