A142270 - OEIS

%I #11 Sep 08 2022 08:45:36

%S 107,193,709,881,967,1483,1741,1913,1999,2687,3203,3461,3547,3719,

%T 4493,4751,5009,5783,5869,6299,7159,7331,7417,7589,7933,8191,8363,

%U 8707,9137,9739,10169,10427,10513,10771,11287,11717,12491,12577,13007,13093,13523

%N Primes congruent to 21 mod 43.

%H Vincenzo Librandi, <a href="/A142270/b142270.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) ~ 42n log n. - _Charles R Greathouse IV_, Jul 03 2016

%t Select[Prime[Range[5000]],MemberQ[{21},Mod[#,43]]&] (* _Vincenzo Librandi_, Aug 25 2012 *)

%o (Magma) [p: p in PrimesUpTo(16000) | p mod 43 eq 21 ]; // _Vincenzo Librandi_, Aug 25 2012

%o (PARI) is(n)=isprime(n) && n%43==21 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040.

%K nonn,easy

%O 1,1

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