The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A142419 Primes congruent to 6 mod 49. 1

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

%S 251,349,643,839,937,1231,1427,1721,2113,2309,2897,3191,3583,3779,

%T 3877,4073,4759,5347,5641,6131,6229,6719,7013,7307,7699,7993,8287,

%U 8581,9463,10247,10639,11423,11717,12011,12109,12697,12893,13187,13873,14461,14657

%N Primes congruent to 6 mod 49.

%H Vincenzo Librandi, <a href="/A142419/b142419.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[{6}, Mod[#, 49]] &] (* _Vincenzo Librandi_, Aug 27 2012 *)

%t Select[Range[6,15000,49],PrimeQ] (* _Harvey P. Dale_, Oct 23 2015 *)

%o (Magma) [p: p in PrimesUpTo(16000) | p mod 49 eq 6]; // _Vincenzo Librandi_, Aug 27 2012

%o (PARI) is(n)=isprime(n) && n%49==6 \\ _Charles R Greathouse IV_, Jul 03 2016

%Y Cf. A000040.

%K nonn,easy

%O 1,1

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 25 17:30 EDT 2024. Contains 372804 sequences. (Running on oeis4.)