A142449 - OEIS

%I #9 Sep 08 2022 08:45:36

%S 41,139,433,727,1021,1217,1511,1609,2099,2393,2687,3079,3373,3863,

%T 4157,4451,4549,5039,5333,5431,6607,6803,7489,8273,8861,9547,9743,

%U 10037,10331,10429,10723,11213,11311,11801,12487,12781,13859,14153,14251,14447,14741

%N Primes congruent to 41 mod 49.

%H Vincenzo Librandi, <a href="/A142449/b142449.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[{41}, Mod[#, 49]] &] (* _Vincenzo Librandi_, Aug 28 2012 *)

%o (Magma) [p: p in PrimesUpTo(17000) | p mod 49 eq 41]; // _Vincenzo Librandi_, Aug 28 2012

%o (PARI) is(n)=isprime(n) && n%49==41 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040.

%K nonn,easy

%O 1,1

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