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 A124486 Numbers k such that 2*k-1, 4*k-1 and 6*k-1 are primes. 2

%I

%S 2,3,12,15,42,45,87,117,120,147,210,330,477,507,612,705,780,792,945,

%T 1002,1065,1170,1275,1347,1470,1680,1695,1797,1902,2175,2187,2205,

%U 2460,2472,2667,3057,3087,4047,4137,4257,4530,4740,4770,5082,5157,5295,5775

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

%H Amiram Eldar, <a href="/A124486/b124486.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[6000], And @@ PrimeQ /@ ({2, 4, 6}*# - 1) &] (* _Ray Chandler_, Nov 21 2006 *)

%Y Cf. A124485-A124492.

%K nonn

%O 1,1

%A _Artur Jasinski_, Nov 04 2006

%E Extended by _Ray Chandler_, Nov 21 2006

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Last modified December 3 12:33 EST 2020. Contains 338904 sequences. (Running on oeis4.)