A142435 - OEIS

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

%S 613,809,907,1103,1201,1789,2083,2377,2671,3259,3847,4337,4729,5023,

%T 5807,6101,6199,6689,6983,7669,7963,8747,9041,9433,9629,9923,10903,

%U 11197,11393,11491,11981,12373,12569,13451,14431,14627,15313,15607,15803,15901,16097

%N Primes congruent to 25 mod 49.

%H Vincenzo Librandi, <a href="/A142435/b142435.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[{25}, Mod[#, 49]] &] (* _Vincenzo Librandi_, Aug 28 2012 *)

%o (Magma) [p: p in PrimesUpTo(17000) | p mod 49 eq 25]; // _Vincenzo Librandi_, Aug 28 2012

%o (PARI) is(n)=isprime(n) && n%49==25 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040.

%K nonn,easy

%O 1,1

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