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A142447 Primes congruent to 39 mod 49. 1

%I #18 Sep 08 2022 08:45:36

%S 137,431,823,1019,1117,1607,1901,1999,2293,3371,3469,4057,4253,4547,

%T 5233,5527,5821,6311,6703,6899,6997,7193,7487,7879,8369,8467,8663,

%U 8761,9349,9643,9839,10133,10427,11113,11701,11897,12289,12583,13171,13367,13759

%N Primes congruent to 39 mod 49.

%H Harvey P. Dale, <a href="/A142447/b142447.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]==39&] (* _Harvey P. Dale_, Apr 01 2011 *)

%t Select[Prime[Range[2500]], MemberQ[{39}, Mod[#, 49]] &] (* _Vincenzo Librandi_, Aug 28 2012 *)

%o (Magma) [p: p in PrimesUpTo(17000) | p mod 49 eq 39]; // _Vincenzo Librandi_, Aug 28 2012

%o (PARI) is(n)=isprime(n) && n%49==39 \\ _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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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)