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%I #9 Sep 08 2022 08:45:36
%S 53,151,347,641,739,1033,1229,1327,1523,1621,2111,2503,2699,2797,3581,
%T 4463,4561,5051,5443,5639,5737,6521,6619,7109,7207,8089,8677,8971,
%U 9461,10343,11519,11617,11813,12107,12401,13381,13577,14557,14753,14851,15439,15733
%N Primes congruent to 4 mod 49.
%H Vincenzo Librandi, <a href="/A142417/b142417.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[2500]], MemberQ[{4}, Mod[#, 49]] &] (* _Vincenzo Librandi_, Aug 27 2012 *)
%o (Magma) [p: p in PrimesUpTo(16000) | p mod 49 eq 4]; // _Vincenzo Librandi_, Aug 27 2012
%o (PARI) is(n)=isprime(n) && n%49==4 \\ _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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