The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A123978 Numbers k for which 8*k+1, 8*k+3 and 8*k+7 are primes. 1

%I

%S 2,5,80,107,110,185,260,332,500,1067,1307,1472,1625,1760,1790,1955,

%T 2255,2612,2627,2672,2882,2945,3197,3335,3467,3965,4007,4037,4040,

%U 4202,4355,4880,5147,5252,5525,6242,6812,6917,6977,7430,7787,8192,8612,8657,8720

%N Numbers k for which 8*k+1, 8*k+3 and 8*k+7 are primes.

%H Amiram Eldar, <a href="/A123978/b123978.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[10^4], And @@ PrimeQ /@ ({1, 3, 7} + 8#) &] (* _Ray Chandler_, Nov 05 2006 *)

%Y Cf. A005122, A005123, A005124.

%K nonn,changed

%O 1,1

%A _Artur Jasinski_, Oct 30 2006

%E Extended by _Ray Chandler_, Nov 05 2006

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

Last modified April 8 08:39 EDT 2020. Contains 333313 sequences. (Running on oeis4.)