The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A124414 Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1, 32*k+1 and 64*k+1 are primes. 2

%I

%S 8325,16650,82950,165900,192795,222870,239400,290235,601560,884220,

%T 971685,1020600,1065570,1120470,1170330,1196715,1263360,1638735,

%U 1768440,1811940,1940190,1948815,2061810,2207685,2240940,2639295,2830905

%N Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1, 32*k+1 and 64*k+1 are primes.

%H Amiram Eldar, <a href="/A124414/b124414.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[15*Range[200000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32, 64}*# + 1) &] (* _Ray Chandler_, Nov 21 2006 *)

%Y Cf. A005097, A123998, A124041, A124412-A124417.

%K nonn

%O 1,1

%A _Artur Jasinski_, Nov 02 2006

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.

Last modified May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)