A142415 - OEIS

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

%S 2,149,443,541,1031,1129,1423,1619,1913,2011,2207,3089,3187,3677,4363,

%T 4657,4951,5147,5441,6029,6323,6421,6911,7499,7793,8087,8969,9067,

%U 9851,9949,10243,10733,10831,11027,11321,11909,12007,12203,12301,12497,12791,12889

%N Primes congruent to 2 mod 49.

%H Vincenzo Librandi, <a href="/A142415/b142415.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[{2}, Mod[#, 49]] &] (* _Vincenzo Librandi_, Aug 27 2012 *)

%t Select[Range[2,13000,49],PrimeQ] (* _Harvey P. Dale_, May 30 2020 *)

%o (Magma) [p: p in PrimesUpTo(16000) | p mod 49 eq 2]; // _Vincenzo Librandi_, Aug 27 2012

%o (PARI) is(n)=isprime(n) && n%49==2 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040.

%K nonn,easy

%O 1,1

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