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 A124489 Numbers k such that 2*k-1, 4*k-1, 6*k-1, 8*k-1, 10*k-1 and 12*k-1 are primes. 2

%I

%S 77385,87675,320775,329175,509355,1137045,1447110,2623005,3310965,

%T 3974880,4095000,4339335,5183220,6163815,6975780,9080190,9462285,

%U 10957170,11139975,11148900,12382755,12796140,15514695,15917580

%N Numbers k such that 2*k-1, 4*k-1, 6*k-1, 8*k-1, 10*k-1 and 12*k-1 are primes.

%H Amiram Eldar, <a href="/A124489/b124489.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[3*5*7*Range[160000], And @@ PrimeQ /@ ({2, 4, 6, 8, 10, 12}*# - 1) &] (* _Ray Chandler_, Nov 21 2006 *)

%t Select[Range[16*10^6],AllTrue[2*Range[6]#-1,PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, Apr 19 2019 *)

%Y Cf. A124485-A124492.

%K nonn

%O 1,1

%A _Artur Jasinski_, Nov 04 2006

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Last modified January 25 11:23 EST 2022. Contains 350567 sequences. (Running on oeis4.)