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%I #14 Nov 04 2023 10:23:40
%S 107,401,499,1087,1283,1381,1871,2459,2557,2753,2851,3733,3929,4027,
%T 4517,4909,5399,5693,5791,5987,6379,6673,6869,6967,7457,8731,9221,
%U 9319,9613,9907,10103,10691,10789,11083,11279,11867,12161,12553,13043,13337,13729
%N Primes congruent to 9 mod 49.
%H Vincenzo Librandi, <a href="/A142421/b142421.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[1700]],Mod[#,49]==9&] (* _Harvey P. Dale_, Apr 20 2011 *)
%t Select[Prime[Range[2500]], MemberQ[{9}, Mod[#, 49]] &] (* _Vincenzo Librandi_, Aug 27 2012 *)
%t Select[Range[9,14000,49],PrimeQ] (* _Harvey P. Dale_, Nov 04 2023 *)
%o (Magma) [p: p in PrimesUpTo(16000) | p mod 49 eq 9]; // _Vincenzo Librandi_, Aug 27 2012
%o (PARI) is(n)=isprime(n) && n%49==9 \\ _Charles R Greathouse IV_, Jul 03 2016
%Y Cf. A000040.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008
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