A124414 - OEIS

%I #11 Mar 25 2020 06:50:36

%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